On tetragonal curves / S.G. Dalalyan -- On pointwise estimates of certain capacity potentials / I.V. Skrynik -- Some singular boundary value problems for partial differential equations / V.P. Palamodov ... Trigonometric series, generalized periodic functions, and boundary value problems of mathematical physics / V.I. Gorbachuk and M.L. Gorbachuk -- On perturbation determinants and a trace formula for certain classes of pairs of operators / M.G. Kreĭn -- Nonlinear equations of integral geometry / S.G. Gindikin -- Topology of absolute minima of functionals of volume type and the Dirichlet functional / Dao Chong Tkhi and A.T. Fomenko -- On a variant of the two-phase Stefan problem / I.I. Danilyuk.