@article{IM2_2017_81_4_a5,
     author = {V. V. Shokurov},
     title = {A criterion for semiampleness},
     journal = {Izvestiya. Mathematics },
     pages = {827--887},
     publisher = {mathdoc},
     volume = {81},
     number = {4},
     year = {2017},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2017_81_4_a5/}
}