Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1996_350_1_a3, author = {E. S. Levitin}, title = {On a distance estimate and the form of a tangent cone to the graph}, journal = {Doklady Akademii Nauk}, pages = {14--18}, publisher = {mathdoc}, volume = {350}, number = {1}, year = {1996}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1996_350_1_a3/} }
E. S. Levitin. On a distance estimate and the form of a tangent cone to the graph. Doklady Akademii Nauk, Tome 350 (1996) no. 1, pp. 14-18. http://geodesic.mathdoc.fr/item/DAN_1996_350_1_a3/