@article{GDZPPN001254316, title = {Strict radicals of monoids.}, journal = {Semigroup forum}, volume = {20}, year = {1980}, pages = {27-66}, zbl = {0447.20046}, url = {http://dml.mathdoc.fr/item/GDZPPN001254316} }
Márki, L.; Strecker, R.; Mlitz, R. Strict radicals of monoids.. Semigroup forum, Tome 20 (1980) pp. 27-66. http://gdmltest.u-ga.fr/item/GDZPPN001254316/