Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1972_203_5_a10, author = {A. Yanushauskas}, title = {A reduction of a directional derivative problem}, journal = {Doklady Akademii Nauk}, pages = {1014--1017}, publisher = {mathdoc}, volume = {203}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1972_203_5_a10/} }
A. Yanushauskas. A reduction of a directional derivative problem. Doklady Akademii Nauk, Tome 203 (1972) no. 5, pp. 1014-1017. http://geodesic.mathdoc.fr/item/DAN_1972_203_5_a10/