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@article{DAN_1992_323_6_a10, author = {V. V. Filippov}, title = {Stationary points and some geometric properties of solutions of}, journal = {Doklady Akademii Nauk}, pages = {1043--1047}, publisher = {mathdoc}, volume = {323}, number = {6}, year = {1992}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1992_323_6_a10/} }
V. V. Filippov. Stationary points and some geometric properties of solutions of. Doklady Akademii Nauk, Tome 323 (1992) no. 6, pp. 1043-1047. http://geodesic.mathdoc.fr/item/DAN_1992_323_6_a10/