@article{106215, author = {Tom\'a\v s Kepka}, title = {Distributive groupoids and preradicals. I.}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {024}, year = {1983}, pages = {183-197}, zbl = {0519.20055}, mrnumber = {703936}, language = {en}, url = {http://dml.mathdoc.fr/item/106215} }
Kepka, Tomáš. Distributive groupoids and preradicals. I.. Commentationes Mathematicae Universitatis Carolinae, Tome 024 (1983) pp. 183-197. http://gdmltest.u-ga.fr/item/106215/
Rings, modules and preradicals, Lecture Notes in pure and appl. math., Marcel Dekker Inc., New York 1982. (1982) | MR 0655412
Distributive groupoids, Rozpravy ČSAV 91/3, 1981. (1981) | MR 0672563