@article{00219478, title = {A concrete analysis of the radical concept.}, journal = {Mathematica Pannonica}, volume = {3}, year = {1992}, pages = {3-15}, zbl = {0783.16011}, language = {en}, url = {http://dml.mathdoc.fr/item/00219478} }
de la Rosa, B.; van Niekerk, J.S.; Wiegandt, R. A concrete analysis of the radical concept.. Mathematica Pannonica, Tome 3 (1992) pp. 3-15. http://gdmltest.u-ga.fr/item/00219478/