@article{GDZPPN001253875, title = {Quasi commutative semigroups and a-reflective semigroups.}, journal = {Semigroup forum}, volume = {20}, year = {1980}, pages = {313-322}, zbl = {0432.20053}, url = {http://dml.mathdoc.fr/item/GDZPPN001253875} }
Varisco, A.; Cherubini, Spoletini A. Quasi commutative semigroups and a-reflective semigroups.. Semigroup forum, Tome 20 (1980) pp. 313-322. http://gdmltest.u-ga.fr/item/GDZPPN001253875/