TY  - JOUR
AU  - Ü. G. Lumiste
TI  - On surfaces $V_n$ with multidimensional isotropic conjugate directions in spaces $R_N$ or $S_N$
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 702
EP  - 705
VL  - 114
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_114_4_a6/
LA  - ru
ID  - DAN_1957_114_4_a6
ER  -