@article{SM_1990_66_1_a12,
     author = {V. V. Nikulin},
     title = {Del {Pezzo} surfaces with log-terminal singularities},
     journal = {Sbornik. Mathematics},
     pages = {231--248},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1990_66_1_a12/}
}