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 Systems of three partial differential equations of the first order with three unknown functions and two independent variables (local theory)A. M. Vasil'ev 457 Distances between finite-dimensional analogs of the $L_p$-spacesV. I. Gurarii, M. I. Kadets, V. I. Matsaev 481 Investigation of the basic equations of the theory of surfaces in asymptotic coordinatesÈ. R. Rozendorn 490 Approximation of functions by positive linear operators and singular integralsV. K. Dzyadyk 508 Asymptotic behavior of functions which are dual in the sense of YoungG. A. Fridman 518 Certain criteria for the completeness of a system of root-vectors of a linear operator in a Banach spaceA. S. Markus 526 Diffraction on dihedral and polyhedral anglesA. F. Filippov 562 The Cauchy problem for parabolic equations degenerating at infinityG. N. Smirnova 591 Homeomorphisms of $R^n$ are $k$-stable for $k\leqslant n-3$A. V. Chernavskii 605