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@article{DE_1988_24_11_a13, author = {K. B. Sabitov}, title = {The maximum principle for equations of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {1967--1976}, publisher = {mathdoc}, volume = {24}, number = {11}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1988_24_11_a13/} }
K. B. Sabitov. The maximum principle for equations of mixed type. Differencialʹnye uravneniâ, Tome 24 (1988) no. 11, pp. 1967-1976. http://geodesic.mathdoc.fr/item/DE_1988_24_11_a13/