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Publication page of Matti Lassas

Here is the list of my publications. I am very willing (of course) to send also paper copies of them to anyone interested. WARNING: The preprints of the papers may differ from the published versions of the articles.

Monographs and monograph dissertation

  1. A. Katchalov, Y. Kurylev, M. Lassas: Inverse Boundary Spectral Problems, Monographs and Surveys in Pure and Applied Mathematics 123, Chapman Hall/CRC-press, 2001, xi+290 pp.

  2. M. Lassas: Non-selfadjoint inverse spectral problems and their applications to random bodies. Annales Academiae Scientiarum Fennicae. Mathematica. Dissertationes 103 (1995), 108 pp.

Submitted papers

  1. J. Sampo, J. Takalo, S. Siltanen, M. Lassas, A. Miettinen and J. Timonen, Curvelet-based method for orientation estimation of particles. Submitted, preprint.

  2. K. Astala, M. Lassas, L. Paivarinta: The borderlines of the invisibility and visibility for Calderon's inverse problem. Submitted, preprint.

  3. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Schrodinger's Hat: Electromagnetic, acoustic and quantum amplifiers via transformation optics. Submitted, preprint

  4. H. Isozaki, Y. Kurylev, M. Lassas: Conic singularities, generalized scattering matrix, and inverse scattering on asymptotically hyperbolic surfaces. Submitted, preprint.

  5. M. Lassas, J. Mueller, S. Siltanen and A. Stahel: The Novikov-Veselov Equation and the Inverse Scattering Method, Part I: Analysis. Submitted, preprint.

  6. M. Lassas, J. Mueller, S. Siltanen and A. Stahel: The Novikov-Veselov Equation and the Inverse Scattering Method, Part II: Computation. Submitted, preprint.

Published papers

In print

  1. K. Krupchyk, M. Lassas: An inverse problem for a hyperbolic system on a vector bundle and energy measurements. To appear in Mathematische Annalen. preprint.

  2. K. Krupchyk, M. Lassas, G. Uhlmann: Inverse boundary value problems for the perturbed polyharmonic operator. To appear in Transactions of American Mathematical Society. preprint

  3. K. Krupchyk, M. Lassas, G. Uhlmann: Inverse problems with partial data for a magnetic Schrödinger operator in an infinite slab and on a bounded domain. To appear in Communications in Mathematical Physics. preprint

  4. T. Helin, M. Lassas, L. Oksanen: An inverse problem for the wave equation with one measurement and the pseudorandom source. To appear in Analysis and PDE. preprint

  5. K. Astala, M. Lassas, L. Paivarinta: The Calderon's Inverse problem - Imaging and Invisibility. In collection Inside out II (Ed. Gunther Uhlmann), Cambridge University press, 56 pp.

  6. G. Milton, M. Lassas: Invisibility cloaking. To appear in Encyclopedia of Applied and Computational Mathematics, Springer Verlag.

2012
  1. K. Krupchyk, M. Lassas, G. Uhlmann: Determining a first order perturbation of the biharmonic operator by partial boundary measurements. Journal of Functional Analysis 262 (2012), 1781-1801. preprint

  2. V. Kolehmainen, M. Lassas, K. Niinimaki and S. Siltanen: Sparsity-promoting Bayesian inversion. Inverse Problems 28 (2012) 025005 (28pp). preprint

2011
  1. K. Krupchyk, M. Lassas, S. Siltanen: Determining electrical and heat transfer parameters using coupled boundary measurements. SIAM Journal on Mathematical Analysis 43 (2011), 2096-2115. preprint

  2. K. Krupchyk, M. Lassas, G. Uhlmann: Inverse problems for differential forms on Riemannian manifolds with boundary. Communications in Partial Differential Equations 36 (2011), 1475-1509. preprint

  3. M. Lassas, T. Zhou: Two dimensional invisibility cloaking for Helmholtz equation and non-local boundary conditions. Mathematical Research Letters 18 (2011), 473-488. preprint.

  4. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Approximate quantum and acoustic cloaking. Journal of Spectral Theory 1 (2011), 27-80. preprint.

  5. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Cloaking a Sensor via Transformation Optics. Physical Review E 83, 016603 (2011). Preprint entitled as "Cloaking vs. shielding in transformation optics". Suplemental material contain three videos (avi-files, each 6.7 MB): cloak in generic mode, cloak in trapping mode, cloak in sensor mode.

  6. T. Helin, M. Lassas: Hierarchical models in statistical inverse problems and the Mumford-Shah funcional. Inverse Problems 27 (2011), 015008, 32 pp. preprint.

  7. M. Lassas, M. Salo, G. Uhlmann: Wave imaging. Chapter in Handbook of Mathematical Methods in Imaging, O. Scherzer (Ed.), Springer-Verlag, 2011, 50 pp. pdf

  8. J. Takalo, J. Timonen, J. Sampo, S. Siltanen, M. Lassas: Determination of the areal material distribution of paper from its optical transmission image. European Physical Journal - Applied Physics 55 (2011), 20701. pdf

  9. M. Lassas, L. Oksanen: The inverse problem for the wave equation and two acquisition geometries. In "Proceedings of Workshop on Inverse Problems, Data and Mathematical Statistics and Ecology" (Eds: Kozlov et al), 2011, Linkoping University, pp. 43-50, article.

2010
  1. Y. Kurylev, M. Lassas, G. Uhlmann: Rigidity of broken geodesic flow and inverse problems. American Journal of Mathematics 132 (2010), 529-562. preprint.

  2. H. Isozaki, Y. Kurylev, M. Lassas: Forward and Inverse scattering on manifolds with asymptotically cylindrical ends. Journal of Functional Analysis 258 (2010), 2060-2118. preprint.

  3. K. Krupchyk, Y. Kurylev, M. Lassas: Reconstruction of Betti numbers of manifolds for anisotropic Maxwell and Dirac systems. Communications in Analysis and Geometry 18 (2010), 963-986. preprint.

  4. M. Lassas, L. Oksanen: Inverse problem for wave equation with sources and observations on disjoint set. Inverse Problems, 26 (2010), 085012. preprint.

  5. V. Kolehmainen, M. Lassas, P. Ola: Calderon's Inverse Problem with an Imperfectly Known Boundary and Reconstruction Up to a Conformal Deformation, SIAM Journal on Mathematical Analysis 42 (2010), 1371-1381. article.

  6. N. Hyvonen, M. Kalke, M. Lassas, H. Setala and S. Siltanen, Three-dimensional X-ray imaging using hybrid data collected with a digital panoramic device. Inverse Problems and Imaging 4 (2010) 257 - 271. preprint.

  7. T. Helin, M. Lassas, S. Siltanen: Infinite Photography: new mathematical model for high-resolution images. Journal of Mathematical Imaging and Vision 36 (2010), 140-158. preprint.

  8. T. Helin, M. Lassas: On the stability of MAP estimation with hierarchical prior distributions. The proceedings of 8th International Conference of Numerical Analysis and Applied Mathematics, AIP Conf. Proc. 1281, 1807 (2010), DOI:10.1063/1.3498240.

2009
  1. Y. Kurylev, M. Lassas: Inverse Problems and Index Formulae for Dirac Operators. Advances in Mathematics 221 (2009), 170-216. preprint.

  2. K. Knudsen, M. Lassas, J. Mueller, S. Siltanen: Regularized D-bar method for the inverse conductivity problem. Inverse Problems and Imaging 3 (2009), 559--642. preprint.

  3. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Cloaking Devices, Electromagnetic Wormholes and Transformation Optics. SIAM Review 51 (2009), 3-33.

  4. M. Dahl, A. Kirpichnikova, M. Lassas: Focusing waves in unknown media by modified time reversal iteration. SIAM Journal on Control and Optimization 48 (2009), Issue 2, 839-858. preprint.

  5. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Invisibility and Inverse Problems. Bulletin of the American Mathematical Society 46 (2009), 55-97. preprint.

  6. M. Lassas, S. Saksman, S. Siltanen: Discretization invariant Bayesian inversion and Besov space priors. Inverse Problems and Imaging 3 (2009), 87-122. preprint.

  7. S. Vanska, M. Lassas, S. Siltanen S: Statistical X-ray tomography using empirical Besov priors. International Journal of Tomography and Statistics 30 (2009), 3-32 preprint.

2008
  1. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Approximate quantum cloaking and almost trapped states. Physical Review Letters 101, 220404 (2008). preprint.

  2. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Isotropic transformation optics: approximate acoustic and quantum cloaking. New Journal of Physics 10 (2008) 115024 (28pp) article.

  3. K. Krupchyk, Y. Kurylev, M. Lassas: Inverse spectral problems on a closed manifold. Journal de Mathematique Pures et Appliquees 90 (2008), Issue 1, 42-59. preprint, article.

  4. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Electromagnetic wormholes via handlebody constructions. Communications in Mathematical Physics 281 (2008), 369-385. article, preprint.

  5. M. Lassas, L. Paivarinta, E. Saksman: Inverse scattering problem for a two dimensional random potential. Communications in Mathematical Physics 279 (2008), 669-703. preprint, article.

  6. V. Kolehmainen, M. Lassas, S. Siltanen: Limited data X-ray tomography using nonlinear evolution equations. The SIAM Journal on Scientific Computing 30 (2008), 1413-1429. preprint, article

  7. V. Kolehmainen, M. Lassas, P. Ola: Electrical Impedance Tomography Problem with Inaccurately Known Boundary and Contact Impedances. IEEE Transactions on Medical Imaging. 27 (2008), 1404-1414. article.

  8. K. Bingham, Y. Kurylev, M. Lassas, S. Siltanen: Iterative time reversal control for inverse problems. Inverse Problems and Imaging 2 (2008), 63-81. pdf.

  9. T. Helin, M. Lassas: Bayesian signal restoration and Mumford-Shah functional, Proc. Appl. Math. Mech. 7 (2008), 2080013-2080014. Special issue: Sixth International Congress on Industrial Applied Mathematics (ICIAM07) article

  10. K. Knudsen, M. Lassas, J. Mueller, S. Siltanen: Reconstructions of Piecewise Constant Conductivities by the D-bar Method for Electrical Impedance Tomography. Journal of Physics: Conference Series 124 (2008), 012029 (9pp). Proceedings of AIP 2007 First International Congress of IPIA. article

  11. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Inverse problems, invisibility, and artificial wormholes. Journal of Physics: Conference Series 124 (2008), 012005 (23pp) Proceedings of AIP 2007 First International Congress of IPIA. article

2007
  1. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Improvement of cylindrical cloaking with the SHS lining. Optics Express 15 (2007), 12717-12734. preprint, article.

  2. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Electromagnetic wormholes and virtual magnetic monopoles from metamaterials. Physical Review Letters 99, 183901 (2007) preprint, article in PRL. The copy of the article has appeared also in Virtual Journal of Nanoscale Science and Technology 16 (2007), Issue 20, article in VJNST.

  3. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Full-wave invisibility of active devices at all frequencies. Communications in Mathematical Physics 275 (2007), 749-789. preprint.

  4. V. Kolehmainen, M. Lassas, P. Ola: The inverse conductivity problem with an imperfectly known boundary in three dimensions. SIAM Journal on Applied Mathematics 67 (2007), 1440-1452. preprint.

  5. V. Kolehmainen, A. Vanne, S., S. Jarvenpaa, J. Kaipio, M. Lassas, M. Kalke: Bayesian Inversion Method for 3-D Dental X-ray Imaging. Elektrotechnik und Informationstechnik (124) 2007, 248-253. preprint.

  6. M. Lassas, J. Mueller, S. Siltanen: Mapping properties of the nonlinear Fourier transform in dimension two. Communications in Partial Differential Equations 32 (2007), 591-610. pdf

  7. K. Knudsen, J. Mueller, M. Lassas, S. Siltanen: D-bar method for Electrical Impedance Tomography with discontinuous coefficients. SIAM Journal on Applied Mathematics 67 (2007), 893-913. pdf

  8. A. Katsuda, Y. Kurylev, M. Lassas: Stability of boundary distance representation and reconstruction of Riemannian manifolds, Inverse Problems and Imaging 1 (2007), 135-157. pdf

  9. V. Kolehmainen, M. Lassas, Petri Ola: Calderon's inverse problem with an imperfectly known boundary in two and three dimensions, Proceedings of Inverse Problems in Applied Sciences, Hokkaido 2006. Journal of Physics: Conference Series 73 (2007), 012002, 10 pp., Institute of Physics Electronic Journals.

2006
  1. Y. Kurylev, M. Lassas, E. Somersalo: Maxwell's equations with a polarization independent wave velocity: Direct and inverse problems, Journal de Mathematique Pures et Appliquees 86 (2006), no. 3, 237-270. pdf

  2. Y. Kurylev, M. Lassas: Multidimensional Gel'fand Inverse Boundary Spectral Problem: Uniqueness and Stability, CUBO Mathematical Journal 8 (2006), no. 1, 41-59. pdf

  3. H. Isozaki, Y. Kurylev, M. Lassas: Inverse Scattering for Waveguides. Seminaire de Theorie Spectrale et Geometrie, 25 (2006-2007), 71-84.

  4. V. Kolehmainen, A. Vanne, S. Siltanen, S. Jarvenpaa. J. Kaipio, M. Lassas, M. Kalke : Parallelized Bayesian inversion for three dimensional dental x-ray imaging. IEEE Transactions on Medical Imaging 25 (2006), 218-228. preprint.

  5. M. Rantala, S. Vanska, S. Jarvenpaa, M. Kalke, M. Lassas, J. Moberg, S. Siltanen: Wavelet-based reconstruction for limited angle X-ray tomography. IEEE Transactions on Medical Imaging 25 (2006), 210-217. preprint.

  6. V. Kolehmainen, M. Lassas, Petri Ola: Electrical impedance tomography problem with inaccurately known boundary and contact impedances. Proceedings of ISBI 2006: IEEE 2006 International Symposium on Biomedical Imaging. Biomedical Imaging: Nano to Macro, 2006. 3rd IEEE International Symposium (2006), p. 1124- 1127.

2005
  1. V. Kolehmainen, M. Lassas, P. Ola: Inverse conductivity problem with an imperfectly known boundary, SIAM Journal on Applied Mathematics 21 (2005), 365-383. pdf

  2. Y. Kurylev, M. Lassas, R. Weder: Multidimensional Borg-Levinson theorem, Inverse Problems 21 (2005), 1685-1697. pdf

  3. K. Astala, M. Lassas, L. Paivarinta: Calderon's inverse problem for anisotropic conductivity in the plane, Communications in Partial Differential Equations 30 (2005), no. 1-3, 207-224. preprint

  4. Y. Kyrylev, M. Lassas: A dynamical inverse problem for Dirac equation, Seminar Notes of Mathmatical Sciences 8 (2005), 35-44, special issue on Topics related with mathmatical physics and their analytical methods (Ed. Hideo Soga) Ibaraki University, Japan.

2004
  1. M. Anderson, A. Katsuda, Y. Kurylev, M. Lassas, M. Taylor: Boundary regularity for the Ricci equation, Geometric Convergence, and Gel'fand's Inverse Boundary Problem, Inventiones Mathematicae 158 (2004), 261-321 preprint

  2. M. Lassas, S. Siltanen: Can one use total variation prior for edge preserving Bayesian inversion, Inverse Problems 20 (2004), 1537-1564. pdf

  3. A. Katchalov, Y. Kurylev, M. Lassas, N. Mandache: Equivalence of time-domain inverse problems and boundary spectral problem, Inverse problems 20 (2004), 419-436. preprint

  4. Y. Kurylev, M. Lassas, E. Somersalo: Focusing waves in electromagnetic inverse problems, Contemporary Mathematics. 348 (2004) (Inverse problems and spectral theory), 11-22, Amer. Math. Soc. pdf ps

  5. M. Lassas, L. Paivarinta, E. Saksman: Inverse problem for a random potential, Contemporary Mathematics. 362 (2004) (Partial Differential Equations, Inverse Problems, and Non-Linear Analysis at Santiago de Chile 2003), 277-288, Amer. Math. Soc. pdf ps

2003
  1. A. Greenleaf, M. Lassas, G. Uhlmann: On nonuniqueness for Calderon's inverse problem, Mathematical Research Letters 10 (2003), no. 5-6, 685-693. pdf ps

  2. M. Lassas, V. Sharafutdinov, G. Uhlmann: Semiglobal boundary rigidity for Riemannian metric, Mathematische Annalen 325 (2003), no. 4, 767-793. pdf ps

  3. A. Greenleaf, M. Lassas, G. Uhlmann:The Calderon problem for conormal potentials, I: Global uniqueness and reconstruction, Communications on Pure and Applied Mathematics 56 (2003), no. 3, 328-352. pdf ps

  4. S. Siltanen, V. Kolehmainen, S. Jarvenpaa, J. Kaipio, P. Koistinen, M. Lassas , J. Pirttila, E. Somersalo: Statistical inversion for X-ray tomography with few radiographs I: General theory. Physics in Medicine and Biology 48 (2003) 1437-1463. pdf

  5. V. Kolehmainen, S. Siltanen, S. Jarvenpaa, J. Kaipio, P. Koistinen, M. Lassas, J. Pirttila, E. Somersalo: Statistical inversion for X-ray tomography with few radiographs II: Applications to dental radiology, Physics in Medicine and Biology 48 (2003) 1465-1490. pdf

  6. M. Anderson, A. Katsuda, Y. Kurylev, M. Lassas, M. Taylor: Metric tensor estimates, geometric convergence, and inverse boundary problems, Electronic Research Announcements of AMS. 9 (2003), 69-79. pdf ps

  7. M. Lassas, M. Taylor, G. Uhlmann: The Dirichlet-to-Neumann map for complete Riemannian manifolds with boundary, Communications in Analysis and Geometry 11 (2003), 207-222. pdf ps

  8. A. Greenleaf, M. Lassas, G. Uhlmann: Anisotropic conductivities that cannot detected in EIT. Physiological Measurement (special issue on Impedance Tomography), 24 (2003), pp. 413-420. pdf ps

  9. A. Katchalov, Y. Kurylev, M. Lassas Energy measurements and equivalence of boundary data for inverse problems on non-compact manifolds. IMA volumes in Mathematics and Applications (Springer Verlag) "Geometric Methods in Inverse Problems and PDE Control" Ed. C. Croke, I. Lasiecka, G. Uhlmann, M. Vogelius, 2004, pp. 183-214. pdf

  10. A. Katsuda, Y. Kurylev, M. Lassas: Stability and Reconstruction in Gel'fand Inverse Boundary Spectral Problem. New analytic and geometric methods in inverse problems. (Ed. K. Bingham, Y. Kurylev, and E. Somersalo), 309-320, Springer-Verlag, 2003. preprint

  11. A. Katchalov, M. Lassas: Gaussian beams and inverse boundary spectral problems, New analytic and geometric methods in inverse problems. (Ed. K. Bingham, Y. Kurylev, and E. Somersalo), 127-151, Springer-Verlag, 2003. pdf ps

  12. Y. Kurylev, M. Lassas, E. Somersalo: Reconstruction of a manifold-from electromagnetic boundary measurements. Contemporary Mathematics. 333 (2003), (Inverse Problems: Theory and Applications. Ed. G. Alessandrini, G. Uhlmann), 147-162, Amer. Math. Soc.

2002
  1. Y. Kurylev, M. Lassas: Dynamical inverse problem for a hyperbolic equation and continuation of data, Proceedings of the Royal Society of Edinburgh. Sect. A. Mathematics 132 (2002), no 4, 931-949. pdf ps

  2. M. Lassas, M. Mataich, S. Siltanen, E. Somersalo: Wind velocity observation with a CW Doppler radar, IEEE Transactions on Remote Sensing 40 (2002), 2427-2438. pdf ps

  3. M. Cheney, D. Isaacson, M. Lassas : Optimal Acoustic Measurements, Ultrawideband Short-Pulse Electromagnetics 5. (Ed. by P.D. Smith and S.R. Cloude), 599-603, Springer-Verlag, 2002. pdf

2001
  1. M. Cheney, D. Isaacson, M. Lassas: Optimal acoustic measurements, SIAM Journal on Applied Mathematics 61 (2001), 1628-1647. pdf ps

  2. M. Lassas, J. Liukkonen, E. Somersalo: Complex Riemannian metric and absorbing boundary condition, Journal de Mathematique Pures et Appliquees (9) 80 (2001), no. 7, 739-768. pdf ps

  3. M. Lassas, E. Somersalo: Analysis of the PML equations in general convex geometry. Proceedings of the Royal Society of Edinburgh. Sect. A. Mathematics 131 (2001), no. 5, 1183-1207 pdf ps

  4. M. Lassas, G. Uhlmann: Determining Riemannian manifold from boundary measurements. Annales Scientifiques de l'Ecole Normale Superieure. (4) 34 (2001), no. 5, 771-787. pdf ps

2000
  1. Y. Kurylev, M. Lassas: Gelf'and Inverse Problem for a Quadratic Operator Pensil. Journal of Functional Analysis, 176 (2000), 247-263. pdf ps

  2. Y. Kyrylev, M. Lassas: Hyperbolic inverse problem with data on a part of the boundary. AMS/IP Stud. Adv. Math. 16 (2000), 259-272, Amer. Math. Soc., Proceedings of Differential equations and mathematical physics (Birmingham, AL, 1999) pdf ps

1999
  1. M. Lassas: The inverse boundary spectral problem for a hyperbolic equation with first order perturbation. Applicable Analysis 70 (1999), 219-231. pdf ps

1998
  1. Y. Kurylev, M. Lassas: Abel-Lidskii basis in non-selfadjoint inverse boundary problem. Zap. Nauchn. semin. POMI, 250 (1998), 161-191 and Mat. Vopr. Teor. Rasprostr. 27, 161-190; Translation in Journal of Mathematical Sciences (New York) 102 (2000), no. 4, 4237-4257.

  2. M. Lassas: Inverse boundary spectral problem for non-selfadjoint Maxwell's equations with incomplete data. Communications in Partial Differential Equations 23 (1998), 629-648.

  3. M. Lassas: The essential spectrum of non-selfadjoint Maxwell operator in a bounded domain. Journal of Mathematical Analysis and Applications 224 (1998), 201-217.

  4. M. Lassas, M. Cheney, G. Uhlmann: Uniqueness for a wave propagation inverse problem in a halfspace. Inverse Problems 4 (1998), 679-684. pdf ps

  5. M. Lassas, E. Somersalo: On the existence and the convergence of the solution of the PML equations. Computing 60 (1998), 229-241 pdf ps

1997
  1. Y. Kurylev, M. Lassas: The multidimensional Gel'fand inverse problem for non-selfadjoint operators. Inverse Problems 13 (1997), 1495-1501.

  2. M. Lassas: Impedance imaging problem as a low frequency limit. Inverse Problems 13 (1997), 1503-1518

Patents

  1. US Patent 7,269,241 - Method and arrangement for medical x-ray imaging and reconstruction from sparse data. S. Siltanen, E. Somersalo, V. Kolehmainen, M. Lassas, J. Kaipio. Also published as WO2004019782, AU2003255550, FI116750B, DE10393159T.

  2. US Patent 7,215,730 - Method and arrangement for multiresolutive reconstruction for medical x-ray imaging. M. Kalke, S. Siltanen, S. Vanska, M. Lassas, M. Rantala. Also published as EP1677256, JP2006187608.

  3. US Patent 7,274,766 - Method and arrangement for three-dimensional medical x-ray imaging J. Kaipio, S. Siltanen, M. Kalke, V. Kolehmainen, M. Lassas. Also published as EP1677255, JP2006187607.

Other works

  1. M. Lassas, R. Lehtinen, J. Saramaki, S. Siltanen (edit.): Who needs MATH? (in Finnish and in Swedish), a booklet popularizing mathemathics for schools students, three prints of 60 000 copies.

  2. M. Lassas: From a coffee cup to surgery - studying applications of mathematics (In Finnish), Arkhimedes 5 (2004), 20-24. pdf

  3. A. Greenleaf, Y. Kurylev, M. Lassas, G. Uhlmann: Invisibility. In Current Events Bulletin of American Mathematical Society. January 8, 2008 (San Diego, California), 22 pp. downloadable copy

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Matti Lassas <Matti.Lassasathelsinki.fi>