TY  - JOUR
AU  - S. E. Karapetyan
TI  - Harmonic quadrics and certain ruled surfaces of congruences
JO  - Doklady Akademii Nauk
PY  - 1958
SP  - 335
EP  - 338
VL  - 122
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1958_122_3_a2/
LA  - ru
ID  - DAN_1958_122_3_a2
ER  -