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 MATHEMATICS Coercive properties of nonlinear Schrödinger and Dirac operatorsK. Kh. Boimatov, A. Sharifov 393 On $\tau$-completeness in the class of determinate functionsV. A. Buevich 399 Morse theory for a class of optimal control problemsS. A. Vakhrameev 404 Semigroup varieties with a modular subvariety latticeM. V. Volkov 409 Removable singularities of $\mathrm{CR}$-functions given on generic manifoldsA. M. Kytmanov, T. N. Nikitina 414 Functional calculus for contractions with an absolutely continuous spectrum, and an operator-valued Carleson measureA. V. Rybkin 417 Invariant tori of reversible systems in the presence of additional even coordinatesM. B. Sevryuk 421 Iterative schemes with noncentered compact approximationsA. I. Tolstykh 425 Properties of free boundaries for a class of degenerate parabolic equations in filtration theoryS. I. Shmarev 431 CYBERNETICS AND THE REGULATION THEORY Determination of the characteristics of multistage digital control systemsE. N. Rozenvasser 436 On the development of a general theory of systemsP. P. Trokhimchuk 441 MATHEMATICAL PHYSICS On the problem of emission tomography for nonhomogeneous mediaV. A. Sharafutdinov 446