%0 Journal Article %A B. J. Gardner %A M. M. Parmenter %T Some classes of directoid groups %J Algebra and discrete mathematics %D 2009 %P 44-58 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/ADM_2009_1_a5/ %G en %F ADM_2009_1_a5