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Contents
• In memory of Vasily Mikhailovich Babich ....... 5
• Babich V. M., Kiselev A. P., Perel M. V., Plachenov A. B. Gaussian wave beams and wave packets in Leningrad and St.Petesburg: a review ....... 7
• Andronov N. I. n subordinate solutions for the Schr\"odinger opera tor with a potential equal to a sum of delta functions ....... 70
• Belishev M. I. An acoustic scattering problem with a sign-indefinite weight function ....... 106
• Belishev M. I., Vakulenko A. F. On convergence of modules and phases of operators and regularization of projecting onto image of operator ....... 124
• Belishev M. I., Korikov D. V. N-transform and factorization of the DN-map ....... 132
• Belishev M. I., Simonov S. A. Self-modeling property of minimal matrix Schr\"odinger and Dirac operators on the half-line ....... 148
• Budyka V. S., Malamud M. M., Pokrovskii I. L. On the self-adjoin tness of some classes of block Jacobi matrices and the associated Schr\"{o}dinger operators with point interactions ....... 163
• Demchenko M. N. Well-posedness of the characteristic problem for the ultrahyperbolic equation with the vector potential ....... 178
• Karazeeva N. A. Asymptotics and Attractor for the system describing 3-D flows with Voight friction ....... 188
• Korikov D. V. On non-homeomorphic surfaces with close DN maps ....... 211
• Levin S. B., Toropov V. O. On the scattering problem of three one-dimensional quantum particles with short-range pairwise potentials and one additional repulsive pairwise potential slowly decreasing at infinity in the Coulomb manner ....... 228
• Matskovskiy A. A., Zavorokhin G. L. Existence of a localized wedge mode in topographic waveguides with a right-angled triangular ridge ....... 254
• Mikhailov V. S. On the complex moment problem ....... 266
• Mikhailov V. S. On a special representation of the Jost solution and the Weyl function for the Dirac system on the half-line ....... 282
• Nazarov S. A. The Kirchhoff plate with hinge-support conditions and a dense periodic family of point fixations ....... 297
• Sloushch V. A., Chuprov I. M. Homogenization of a one-dimensional periodic fourth-order operator with a singular potential, taking cor\-rec\-tors into account ....... 326}%59
• Sloushch V. A., Chuprov I. M. Homogenization of a one-dimensional periodic fourth-order operator with a singular potential, taking correctors into account ....... 326
• Reviews ....... 358

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• Paging 365 pp.

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