Necessary and sufficient condition of isomorphism for multiplicative and additive systems without continuity condition with the accuracy up to grinding divisions von Kozachenko, M. Yu., Козаченко, М. Ю.

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Limiting theorem for the parametrical stochastic operator systems von Butsan , G. P., Kozachenko, M. Yu., Буцан , Г. П., Козаченко , М. Ю.

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