@article{10_1017_S0017089500031323,
     author = {Blyth, T. S. and Giraldes, Em{\'\i}lia and Marques-Smith, M. Paula O.},
     title = {Congruences on orthodox semigroups with associate subgroups},
     journal = {Glasgow mathematical journal},
     pages = {113--124},
     year = {1996},
     volume = {38},
     number = {1},
     doi = {10.1017/S0017089500031323},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500031323/}
}