TY  - JOUR
AU  - M. E. Tsypkin
TI  - An expression for the measures of curvature and torsion for an unusual ruled surface
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1964
SP  - 144
EP  - 152
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1964_1_a19/
LA  - ru
ID  - IVM_1964_1_a19
ER  -