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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 18, No. 5, pp. 1065–1072, September–October, 1977.
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Lavrent'ev, M.M., Amirov, A.K. Conditions under which the Cauchy problem is well posed for a given equation. Sib Math J 18, 753–770 (1977). https://doi.org/10.1007/BF00967013
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DOI: https://doi.org/10.1007/BF00967013