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@article{DAN_1989_309_3_a2, author = {V. F. Dem'yanov}, title = {Second-order approximation for a nonsmooth function}, journal = {Doklady Akademii Nauk}, pages = {529--532}, publisher = {mathdoc}, volume = {309}, number = {3}, year = {1989}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1989_309_3_a2/} }
V. F. Dem'yanov. Second-order approximation for a nonsmooth function. Doklady Akademii Nauk, Tome 309 (1989) no. 3, pp. 529-532. http://geodesic.mathdoc.fr/item/DAN_1989_309_3_a2/