%0 Journal Article %A Crvenković, Siniša %A Dudek, Józef %T Rectangular groupoids %J Czechoslovak Mathematical Journal %D 1985 %P 405-414 %V 35 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1985.102030/ %R 10.21136/CMJ.1985.102030 %G en %F 10_21136_CMJ_1985_102030