@article{10_1017_S0017089500001610,
     author = {Hall, T. E.},
     title = {Congruences and {Green's} relations on regular semigroups},
     journal = {Glasgow mathematical journal},
     pages = {167--175},
     year = {1972},
     volume = {13},
     number = {2},
     doi = {10.1017/S0017089500001610},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001610/}
}