On the structure of semigroups which are unions of groups.
Warne, R.J.
Semigroup forum, Tome 4 (1972), p. 323-330 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1972-01-01
EUDML-ID : urn:eudml:doc:133949 
@article{GDZPPN001248898,
     title = {On the structure of semigroups which are unions of groups.},
     journal = {Semigroup forum},
     volume = {4},
     year = {1972},
     pages = {323-330},
     zbl = {0275.20107},
     url = {http://dml.mathdoc.fr/item/GDZPPN001248898}
}

Warne, R.J. On the structure of semigroups which are unions of groups.. Semigroup forum, Tome 4 (1972) pp. 323-330. http://gdmltest.u-ga.fr/item/GDZPPN001248898/