Minimal group congruences need not be smallest.
Schein, B.M.
Semigroup forum, Tome 4 (1972), p. 273-276 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1972-01-01
EUDML-ID : urn:eudml:doc:133946 
@article{GDZPPN001248855,
     title = {Minimal group congruences need not be smallest.},
     journal = {Semigroup forum},
     volume = {4},
     year = {1972},
     pages = {273-276},
     zbl = {0261.20051},
     url = {http://dml.mathdoc.fr/item/GDZPPN001248855}
}

Schein, B.M. Minimal group congruences need not be smallest.. Semigroup forum, Tome 4 (1972) pp. 273-276. http://gdmltest.u-ga.fr/item/GDZPPN001248855/