TY  - JOUR
AU  - Tetsuya Ando
TI  - On extremal rays of the higher dimensional varieties.
JO  - Inventiones mathematicae
PY  - 1985
SP  - 347
EP  - 358
VL  - 81
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IM_1985__81_143259/
ID  - IM_1985__81_143259
ER  -