%0 Journal Article %A V. A. Iskovskikh %T Rational surfaces with a~pencil of rational curves and with positive square of the canonical class %J Sbornik. Mathematics %D 1970 %P 91-117 %V 12 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_1970_12_1_a5/ %G en %F SM_1970_12_1_a5