Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1969_185_6_a12, author = {V. A. Startsev}, title = {Symmetric continuity and symmetric differentiability with respect to sets}, journal = {Doklady Akademii Nauk}, pages = {1251--1253}, publisher = {mathdoc}, volume = {185}, number = {6}, year = {1969}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1969_185_6_a12/} }
V. A. Startsev. Symmetric continuity and symmetric differentiability with respect to sets. Doklady Akademii Nauk, Tome 185 (1969) no. 6, pp. 1251-1253. http://geodesic.mathdoc.fr/item/DAN_1969_185_6_a12/