TY  - JOUR
AU  - R. N. Shcherbakov
TI  - Projective invariant marks of a ruled surface belonging to a given congruence
JO  - Doklady Akademii Nauk
PY  - 1957
SP  - 390
EP  - 393
VL  - 112
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1957_112_3_a5/
LA  - ru
ID  - DAN_1957_112_3_a5
ER  -