@article{GDZPPN002435942, title = {Length of Extremal Rays and Generalized Adjunction.}, journal = {Mathematische Zeitschrift}, volume = {199}, year = {1988}, pages = {409-428}, zbl = {0668.14004}, url = {http://dml.mathdoc.fr/item/GDZPPN002435942} }
Wisniewski, Jaroslaw A. Length of Extremal Rays and Generalized Adjunction.. Mathematische Zeitschrift, Tome 199 (1988) pp. 409-428. http://gdmltest.u-ga.fr/item/GDZPPN002435942/