@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/}
}