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@article{DE_1977_13_1_a6, author = {V. P. Didenko}, title = {A variational problem for equations of mixed type}, journal = {Differencialʹnye uravneni\^a}, pages = {44--49}, publisher = {mathdoc}, volume = {13}, number = {1}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1977_13_1_a6/} }
V. P. Didenko. A variational problem for equations of mixed type. Differencialʹnye uravneniâ, Tome 13 (1977) no. 1, pp. 44-49. http://geodesic.mathdoc.fr/item/DE_1977_13_1_a6/