Dokl. Akad. Nauk, 1992, Volume 326, Number 3

JOURNALS // Doklady Akademii Nauk // Archive

1992, Volume 326, Number 3

MATHEMATICS
	Coercive properties of nonlinear Schrödinger and Dirac operators K. Kh. Boimatov, A. Sharifov	393
	On $\tau$-completeness in the class of determinate functions V. A. Buevich	399
	Morse theory for a class of optimal control problems S. A. Vakhrameev	404
	Semigroup varieties with a modular subvariety lattice M. V. Volkov	409
	Removable singularities of $\mathrm{CR}$-functions given on generic manifolds A. M. Kytmanov, T. N. Nikitina	414
	Functional calculus for contractions with an absolutely continuous spectrum, and an operator-valued Carleson measure A. V. Rybkin	417
	Invariant tori of reversible systems in the presence of additional even coordinates M. B. Sevryuk	421
	Iterative schemes with noncentered compact approximations A. I. Tolstykh	425
	Properties of free boundaries for a class of degenerate parabolic equations in filtration theory S. I. Shmarev	431

CYBERNETICS AND THE REGULATION THEORY
	Determination of the characteristics of multistage digital control systems E. N. Rozenvasser	436
	On the development of a general theory of systems P. P. Trokhimchuk	441

MATHEMATICAL PHYSICS
	On the problem of emission tomography for nonhomogeneous media V. A. Sharafutdinov	446