%0 Journal Article %A Val, Patrick du %T Rational Surfaces with Exceptional Unodes %J Canadian journal of mathematics %D 1967 %P 938-951 %V 19 %N 1 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1967-086-8/ %R 10.4153/CJM-1967-086-8 %F 10_4153_CJM_1967_086_8