TY  - JOUR
AU  - A. D. Aleksandrov
TI  - Mappings that preserve congruence
JO  - Doklady Akademii Nauk
PY  - 1973
SP  - 1257
EP  - 1260
VL  - 211
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1973_211_6_a0/
LA  - ru
ID  - DAN_1973_211_6_a0
ER  -