@article{2757, author = {Propes, R.E.}, title = {Some notes on upper radical classes}, journal = {Portugaliae mathematica}, volume = {34}, year = {1975}, pages = {21-23}, zbl = {0315.16006}, mrnumber = {0387336}, language = {en}, url = {http://dml.mathdoc.fr/item/2757} }
Propes, R.E. Some notes on upper radical classes. Portugaliae mathematica, Tome 34 (1975) pp. 21-23. http://gdmltest.u-ga.fr/item/2757/