A Bogolyubov type theorem for hyperbolic equations
English version (Springer): Ukrainian Mathematical Journal 22 (1970), no. 3, pp 326-331.
Citation Example: Kiselevich M. A Bogolyubov type theorem for hyperbolic equations // Ukr. Mat. Zh. - 1970. - 22, № 3. - pp. 374–379.
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