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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
 
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