@article{SF_1974__8_134045,
     author = {L. O'Carroll},
     title = {Reduced inverse semigroups.},
     journal = {Semigroup forum},
     pages = {270--276},
     publisher = {mathdoc},
     volume = {8},
     year = {1974},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__8_134045/}
}