Direct and inverse theorems of approximate methods for the solution of an abstract Cauchy problem von Torba, S. M., Торба, С. М.

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Characterization of the rate of convergence of one approximate method for the solution of an abstract Cauchy problem von Kashpirovskii, A. I., Torba, S. M., Кашпіровський, О. І., Торба, С. М.

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Direct and Inverse Theorems in the Theory of Approximation by the Ritz Method von Gorbachuk, M. L., Hrushka, Ya. I., Torba, S. M., Горбачук, М. Л., Грушка, Я. І., Торба, С. М.

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