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@article{SF_1982__25_134587, author = {B. Baird}, title = {The group of units as a maximal inverse subsemigroup.}, journal = {Semigroup forum}, pages = {381--382}, publisher = {mathdoc}, volume = {25}, year = {1982}, zbl = {0499.20042}, url = {http://geodesic.mathdoc.fr/item/SF_1982__25_134587/} }
B. Baird. The group of units as a maximal inverse subsemigroup.. Semigroup forum, Tome 25 (1982), pp. 381-382. http://geodesic.mathdoc.fr/item/SF_1982__25_134587/