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@article{DAN_1965_165_6_a7, author = {\`E. M. Saak}, title = {Approximation theorems for differential equations}, journal = {Doklady Akademii Nauk}, pages = {1249--1252}, publisher = {mathdoc}, volume = {165}, number = {6}, year = {1965}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1965_165_6_a7/} }
È. M. Saak. Approximation theorems for differential equations. Doklady Akademii Nauk, Tome 165 (1965) no. 6, pp. 1249-1252. http://geodesic.mathdoc.fr/item/DAN_1965_165_6_a7/