@article{DAN_1989_306_3_a1,
     author = {V. A. Alexeev and V. V. Nikulin},
     title = {Classification of del {Pezzo} surfaces with log-terminal singularities of index $\le 2$, and involutions on {K3} surfaces},
     journal = {Doklady Akademii Nauk},
     pages = {525--528},
     publisher = {mathdoc},
     volume = {306},
     number = {3},
     year = {1989},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1989_306_3_a1/}
}