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Translated from Matematicheskie Zametki, Vol. 30, No. 3, pp. 363–369, September, 1981.
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Tazhimuratov, I. Periodic solutions of a system of first-order partial differential equations. Mathematical Notes of the Academy of Sciences of the USSR 30, 672–675 (1981). https://doi.org/10.1007/BF01141623
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DOI: https://doi.org/10.1007/BF01141623