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@article{SF_1972__5_133946, author = {B.M. Schein}, title = {Minimal group congruences need not be smallest.}, journal = {Semigroup forum}, pages = {273--276}, publisher = {mathdoc}, volume = {5}, year = {1972}, zbl = {0261.20051}, url = {http://geodesic.mathdoc.fr/item/SF_1972__5_133946/} }
B.M. Schein. Minimal group congruences need not be smallest.. Semigroup forum, Tome 5 (1972), pp. 273-276. http://geodesic.mathdoc.fr/item/SF_1972__5_133946/