@article{GDZPPN001253549, title = {Brandt groupiods and semigroups.}, journal = {Semigroup forum}, volume = {18}, year = {1979}, pages = {307-312}, url = {http://dml.mathdoc.fr/item/GDZPPN001253549} }
Banaschewski, B. Brandt groupiods and semigroups.. Semigroup forum, Tome 18 (1979) pp. 307-312. http://gdmltest.u-ga.fr/item/GDZPPN001253549/