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 On continuity of geodesic frameworks of flows on surfacesS. Kh. Aranson, E. V. Zhuzhoma, V. S. Medvedev 3 Topology of spaces of probability measuresT. O. Banakh, T. N. Radul 23 Representation varieties of the fundamental groups of non-orientable surfacesV. V. Benyash-Krivets, V. I. Chernousov 47 Boundedness of the Hardy and the Hardy–Littlewood operators in the spaces $\operatorname {Re}H^1$ and $\mathrm {BMO}$B. I. Golubov 93 The structure of infinitesimal symmetries of geodesic flows on a two-dimensional torusN. V. Denisova 107 Completeness of systems of eigenfunctions for the Sturm–Liouville operator with potential depending on the spectral parameter and for one non-linear problemP. E. Zhidkov 123 A criterion for orbital equivalence of integrable Hamiltonian systems in the vicinity of elliptic orbits. An orbital invariant in the Lagrange problemO. E. Orel 139