@article{10_1017_S0017089500002445,
     author = {O'Carroll, Liam},
     title = {Inverse semigroups as extensions of semilattices},
     journal = {Glasgow mathematical journal},
     pages = {12--21},
     year = {1975},
     volume = {16},
     number = {1},
     doi = {10.1017/S0017089500002445},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002445/}
}