%0 Journal Article %A Propes, R.E. %T Some notes on upper radical classes %J Portugaliae mathematica %D 1975 %P 21-23 %V 34 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1975__34_1_115247/ %G en %F PORMA_1975__34_1_115247