%0 Journal Article %A Chajda, Ivan %T A groupoid characterization of Boolean algebras %J Discussiones Mathematicae. General Algebra and Applications %D 2004 %P 177-184 %V 24 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DMGAA_2004_24_2_a1/ %G en %F DMGAA_2004_24_2_a1