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@article{DAN_1970_194_2_a6, author = {V. L. Levin}, title = {The subdifferential of a composite functional}, journal = {Doklady Akademii Nauk}, pages = {268--269}, publisher = {mathdoc}, volume = {194}, number = {2}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_194_2_a6/} }
V. L. Levin. The subdifferential of a composite functional. Doklady Akademii Nauk, Tome 194 (1970) no. 2, pp. 268-269. http://geodesic.mathdoc.fr/item/DAN_1970_194_2_a6/