%0 Journal Article %A Goeters, H. Pat %A Ullery, William %T Butler groups and lattices of types %J Commentationes Mathematicae Universitatis Carolinae %D 1990 %P 613-619 %V 31 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1990__31_4_a0/ %G en %F CMUC_1990__31_4_a0