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@article{PORMA_1967__26_1_115003, author = {Medeiros, Luiz Adauto}, title = {An application of semigroups of class $C_0$}, journal = {Portugaliae mathematica}, pages = {71--77}, publisher = {mathdoc}, volume = {26}, number = {1}, year = {1967}, mrnumber = {0250127}, zbl = {0169.43502}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_115003/} }
Medeiros, Luiz Adauto. An application of semigroups of class $C_0$. Portugaliae mathematica, Tome 26 (1967) no. 1, pp. 71-77. http://geodesic.mathdoc.fr/item/PORMA_1967__26_1_115003/