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@article{DE_1988_24_9_a4, author = {S. A. Laptev}, title = {A variational problem for a dynamic potential}, journal = {Differencialʹnye uravneni\^a}, pages = {1509--1520}, publisher = {mathdoc}, volume = {24}, number = {9}, year = {1988}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1988_24_9_a4/} }
S. A. Laptev. A variational problem for a dynamic potential. Differencialʹnye uravneniâ, Tome 24 (1988) no. 9, pp. 1509-1520. http://geodesic.mathdoc.fr/item/DE_1988_24_9_a4/