@article{GDZPPN001249916, title = {Reduced inverse semigroups.}, journal = {Semigroup forum}, volume = {7}, year = {1974}, pages = {270-276}, url = {http://dml.mathdoc.fr/item/GDZPPN001249916} }
O'Carroll, L. Reduced inverse semigroups.. Semigroup forum, Tome 7 (1974) pp. 270-276. http://gdmltest.u-ga.fr/item/GDZPPN001249916/