TY  - JOUR
AU  - F. L. Litvin
TI  - Determination of the enveloping lines of contact of mutually enveloped surfaces
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1975
SP  - 47
EP  - 50
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1975_10_a4/
LA  - ru
ID  - IVM_1975_10_a4
ER  -