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@article{DE_1991_27_5_a0, author = {E. R. Avakov}, title = {First-order necessary conditions for abnormal problems in the calculus of variations}, journal = {Differencialʹnye uravneni\^a}, pages = {739--745}, publisher = {mathdoc}, volume = {27}, number = {5}, year = {1991}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1991_27_5_a0/} }
E. R. Avakov. First-order necessary conditions for abnormal problems in the calculus of variations. Differencialʹnye uravneniâ, Tome 27 (1991) no. 5, pp. 739-745. http://geodesic.mathdoc.fr/item/DE_1991_27_5_a0/