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Additional information
Voronezh. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 30, No. 1, pp. 188–189, January–February, 1989.
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Lyubomudrova, O.Y. A certain partial differential equation. Sib Math J 30, 146–147 (1989). https://doi.org/10.1007/BF01054231
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DOI: https://doi.org/10.1007/BF01054231