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@article{DAN_1973_211_6_a0, author = {A. D. Aleksandrov}, title = {Mappings that preserve congruence}, journal = {Doklady Akademii Nauk}, pages = {1257--1260}, publisher = {mathdoc}, volume = {211}, number = {6}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_6_a0/} }
A. D. Aleksandrov. Mappings that preserve congruence. Doklady Akademii Nauk, Tome 211 (1973) no. 6, pp. 1257-1260. http://geodesic.mathdoc.fr/item/DAN_1973_211_6_a0/