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@article{DAN_1989_309_6_a9, author = {K. B. Sabitov}, title = {Maximum modulus principles for some classes of second-order}, journal = {Doklady Akademii Nauk}, pages = {1321--1324}, publisher = {mathdoc}, volume = {309}, number = {6}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a9/} }
K. B. Sabitov. Maximum modulus principles for some classes of second-order. Doklady Akademii Nauk, Tome 309 (1989) no. 6, pp. 1321-1324. http://geodesic.mathdoc.fr/item/DAN_1989_309_6_a9/