TY  - JOUR
AU  - M. V. Dragnev
AU  - V. V. Ryzhkov
TI  - On the differential geometry of mappings of ruled projective spaces
JO  - Trudy Geometricheskogo Seminara
PY  - 1975
SP  - 49
EP  - 56
VL  - 8
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/KUTGS_1975_8_a5/
LA  - ru
ID  - KUTGS_1975_8_a5
ER  -