TY  - JOUR
AU  - R. M. Geidel'man
TI  - The theory of a hypersurface in four-dimensional non-Euclidean spaces
JO  - Doklady Akademii Nauk
PY  - 1961
SP  - 1040
EP  - 1043
VL  - 139
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1961_139_5_a2/
LA  - ru
ID  - DAN_1961_139_5_a2
ER  -