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Additional information
Novosibirsk. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 31, No. 6, pp. 211–214, November–December, 1990.
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Orlova, S.A. First boundary problem for a directly and inversely ultraparabolic equation. Sib Math J 31, 1054–1057 (1990). https://doi.org/10.1007/BF00970073
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DOI: https://doi.org/10.1007/BF00970073