%0 Journal Article %A V. A. Alexeev %A V. V. Nikulin %T Classification of del Pezzo surfaces with log-terminal singularities of index $\le 2$, and involutions on K3 surfaces %J Doklady Akademii Nauk %D 1989 %P 525-528 %V 306 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1989_306_3_a1/ %G ru %F DAN_1989_306_3_a1