@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/