TY  - JOUR
AU  - V. V. Shurygin
TI  - Generalization of a theorem
JO  - Trudy Geometricheskogo Seminara
PY  - 1979
SP  - 120
EP  - 124
VL  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/KUTGS_1979_11_a14/
LA  - ru
ID  - KUTGS_1979_11_a14
ER  -