@article{04029835,
title = {Embedding semigroups in groups. A geometrical approach.},
journal = {Publications de l'Institut Math\'ematique. Nouvelle S\'erie},
volume = {37(51)},
year = {1985},
pages = {69-82},
zbl = {0633.20034},
language = {en},
url = {http://dml.mathdoc.fr/item/04029835}
}
Krstić, Sava. Embedding semigroups in groups. A geometrical approach.. Publications de l'Institut Mathématique. Nouvelle Série, Tome 37(51) (1985) pp. 69-82. http://gdmltest.u-ga.fr/item/04029835/