@article{SM_1970_12_1_a5,
     author = {V. A. Iskovskikh},
     title = {Rational surfaces with a~pencil of rational curves and with positive square of the canonical class},
     journal = {Sbornik. Mathematics},
     pages = {91--117},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1970},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1970_12_1_a5/}
}