Minimal group congruences need not be smallest.
Semigroup forum, Tome 5 (1972), pp. 273-276.

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     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/}
}
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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/