%0 Journal Article %A Tichý, Tomáš %A Vinárek, Jiří %T On the algebraic characterization of systems of $1-1$ partial mappings %J Commentationes Mathematicae Universitatis Carolinae %D 1972 %P 711-720 %V 13 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1972__13_4_a9/ %G en %F CMUC_1972__13_4_a9