@article{SF_1976__12_134177,
     author = {J.A. Hildebrant},
     title = {Extending congruences on factors of ideally compactifiable semigroups.},
     journal = {Semigroup forum},
     pages = {245--250},
     year = {1976},
     volume = {12},
     zbl = {0327.22001},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134177/}
}