TY  - JOUR
AU  - V. V. Shokurov
TI  - On~the closed cone of curves of algebraic 3-folds
JO  - Izvestiya. Mathematics 
PY  - 1985
SP  - 193
EP  - 198
VL  - 24
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM2_1985_24_1_a7/
LA  - en
ID  - IM2_1985_24_1_a7
ER  -