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 Classification of closed minimal networks on flat two-dimensional toriA. O. Ivanov, I. V. Ptitsyna, A. A. Tuzhilin 3 Maximal tubes and bands in Minkowski spaceV. M. Miklyukov 45 The problem of cutting subspacesM. D. Kovalev 77 On Zeeman's filtration in homologyE. G. Sklyarenko 103 The structure of the congruence kernel for $\mathrm{SL}_2$ in the case of a global field of positive characteristicP. A. Zalesskii 117 Adding relations to instanton homology groups of Seifert fibered homology spheresN. N. Savel'ev 125 Classification of four-dimensional integrable Hamiltonian systems and Poisson actions of $\mathbb{R}^2$ in extended neighborhoods of simple singular points. IL. M. Lerman, Ya. L. Umanskii 141