@article{10_1017_S0017089500002494,
     author = {McFadden, R.},
     title = {Proper {Dubreil-Jacotin} inverse semigroups},
     journal = {Glasgow mathematical journal},
     pages = {40--51},
     year = {1975},
     volume = {16},
     number = {1},
     doi = {10.1017/S0017089500002494},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500002494/}
}