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Additional information
Translated from Sibirskii Matematicheskii Zhurnal, Vol. 14, No. 1, pp. 221–228, January–February, 1973.
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Kovalenko, L.I. An extremum principle for the generalized solution of an equation of mixed type with lowest terms. Sib Math J 14, 158–163 (1973). https://doi.org/10.1007/BF00967278
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DOI: https://doi.org/10.1007/BF00967278