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Translated from Sibirskii Matematicheskii Zhurnal, Vol. 8, No. 1, pp. 19–48, January–February, 1967.
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Nakhyshev, A.M. Some problems for an equation of mixed type with two parabolic lines. Sib Math J 8, 13–34 (1967). https://doi.org/10.1007/BF01040569
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DOI: https://doi.org/10.1007/BF01040569