@article{DE_1988_24_11_a4,
     author = {S. A. Laptev},
     title = {Solution of a variational problem for dynamic potential},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1880--1890},
     publisher = {mathdoc},
     volume = {24},
     number = {11},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1988_24_11_a4/}
}