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@article{DAN_1989_305_4_a2, author = {K. B. Sabitov}, title = {The maximum principle for systems of second-order equations of}, journal = {Doklady Akademii Nauk}, pages = {783--786}, publisher = {mathdoc}, volume = {305}, number = {4}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_305_4_a2/} }
K. B. Sabitov. The maximum principle for systems of second-order equations of. Doklady Akademii Nauk, Tome 305 (1989) no. 4, pp. 783-786. http://geodesic.mathdoc.fr/item/DAN_1989_305_4_a2/