@article{10_1017_S0017089500006686,
     author = {Gould, Victoria},
     title = {Coperfect monoids},
     journal = {Glasgow mathematical journal},
     pages = {73--88},
     year = {1987},
     volume = {29},
     number = {1},
     doi = {10.1017/S0017089500006686},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500006686/}
}