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@article{DAN_1963_150_5_a10, author = {G. Kh. Sindalovskii}, title = {Congruent and asymptotic differentiability}, journal = {Doklady Akademii Nauk}, pages = {995--997}, publisher = {mathdoc}, volume = {150}, number = {5}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1963_150_5_a10/} }
G. Kh. Sindalovskii. Congruent and asymptotic differentiability. Doklady Akademii Nauk, Tome 150 (1963) no. 5, pp. 995-997. http://geodesic.mathdoc.fr/item/DAN_1963_150_5_a10/