%0 Journal Article %A Medeiros, Luiz Adauto %T An application of semigroups of class $C_0$ %J Portugaliae mathematica %D 1967 %P 71-77 %V 26 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_115003/ %G en %F PORMA_1967__26_1_115003