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 On differential properties of weak solutions of nonlinear elliptic systems arising in plasticity theoryG. A. Seregin 291 Contractions of the actions of reductive algebraic groupsV. L. Popov 310 Summability of the logarithm of an almost analytic function and a generalization of the Levinson–Cartwright theoremA. L. Vol'berg, B. Jöricke 335 The direct and inverse scattering problems for the one-dimensional perturbed Hill operatorN. E. Firsova 349 On perturbation of a polyharmonic operator by delta-like potentialsA. Fraguela Collar 386 Equilibrium statistical solutions for dynamical systems with an infinite number of degrees of freedomI. D. Chueshov 394 Two theorems on divisibility and torsion in Milnor's $K$-groupsR. A. Bogomolov 404 Explicit duality formulas for symplectic and orthogonal Hecke operators on theta-series of positive quadratic formsV. G. Zhuravlev 413