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@article{PORMA_1975__34_1_115247, author = {Propes, R.E.}, title = {Some notes on upper radical classes}, journal = {Portugaliae mathematica}, pages = {21--23}, publisher = {mathdoc}, volume = {34}, number = {1}, year = {1975}, mrnumber = {0387336}, zbl = {0315.16006}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1975__34_1_115247/} }
Propes, R.E. Some notes on upper radical classes. Portugaliae mathematica, Tome 34 (1975) no. 1, pp. 21-23. http://geodesic.mathdoc.fr/item/PORMA_1975__34_1_115247/