@article{GDZPPN001248480,
title = {Building semigroups from groups (and reduced semigroups).},
journal = {Semigroup forum},
volume = {4},
year = {1972},
pages = {327-334},
zbl = {0273.20044},
url = {http://dml.mathdoc.fr/item/GDZPPN001248480}
}
Grillet, P. Building semigroups from groups (and reduced semigroups).. Semigroup forum, Tome 4 (1972) pp. 327-334. http://gdmltest.u-ga.fr/item/GDZPPN001248480/