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Additional information
Moscow Physicotechnical Institute, Moscow. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 22, No. 1, pp. 100–110, January–February, 1981.
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Kovalenko, L.I. An extremum principle for a generalized solution of equations of hyperbolic and mixed type. Sib Math J 22, 73–81 (1981). https://doi.org/10.1007/BF00968202
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DOI: https://doi.org/10.1007/BF00968202