@article{MAN_1959__139_160734,
     author = {G.B. PRESTON},
     title = {Congruences on {Brandt} {Semigroups.}},
     journal = {Mathematische Annalen},
     pages = {91--94},
     publisher = {mathdoc},
     volume = {139},
     year = {1959},
     zbl = {0092.01803},
     url = {http://geodesic.mathdoc.fr/item/MAN_1959__139_160734/}
}