%0 Journal Article %A Schwarz, Štefan %T On idempotent binary relations on a finite set %J Czechoslovak Mathematical Journal %D 1970 %P 696-702 %V 20 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1970.100991/ %R 10.21136/CMJ.1970.100991 %G en %F 10_21136_CMJ_1970_100991