%0 Journal Article %A Cecchi, M. %A Došlá, Z. %A Marini, M. %T Some properties of third order differential operators %J Czechoslovak Mathematical Journal %D 1997 %P 729-748 %V 47 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMJ_1997__47_4_a11/ %G en %F CMJ_1997__47_4_a11