%0 Journal Article %A Šír, Zbyněk %T Properties of operators occurring in the Penrose transform %J Commentationes Mathematicae Universitatis Carolinae %D 2001 %P 681-690 %V 42 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_2001__42_4_a8/ %G en %F CMUC_2001__42_4_a8