@article{IM2_1989_33_2_a6,
     author = {V. V. Nikulin},
     title = {Del {Pezzo} surfaces with log-terminal {singularities.~II}},
     journal = {Izvestiya. Mathematics },
     pages = {355--372},
     publisher = {mathdoc},
     volume = {33},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1989_33_2_a6/}
}