@article{SF_1972__4_133894,
     author = {G.R. Baird},
     title = {Congruences on generalized inverse semigroups.},
     journal = {Semigroup forum},
     pages = {200--205},
     publisher = {mathdoc},
     volume = {4},
     year = {1972},
     zbl = {0265.20052},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133894/}
}