%0 Journal Article %A Bennet, Mary Katherine %T A characterization of a category of discrete transformation groups %J Portugaliae mathematica %D 1969 %P 71-73 %V 28 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1969__28_2_115083/ %G en %F PORMA_1969__28_2_115083