@article{10_1017_S0017089500009873,
     author = {Fountain, John and Gomes, Gracinda M. S.},
     title = {Proper left {type-A} monoids revisited},
     journal = {Glasgow mathematical journal},
     pages = {293--306},
     year = {1993},
     volume = {35},
     number = {3},
     doi = {10.1017/S0017089500009873},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500009873/}
}