%0 Journal Article %A Shyuichi Izumiya %T Systems of Clairaut type %J Colloquium Mathematicum %D 1993 %P 219-226 %V 66 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-66-2-219-226/ %R 10.4064/cm-66-2-219-226 %G de %F 10_4064_cm_66_2_219_226