@article{GDZPPN001248251,
title = {Is minimal group congruence smallest?},
journal = {Semigroup forum},
volume = {4},
year = {1972},
pages = {173-176},
zbl = {0256.20080},
url = {http://dml.mathdoc.fr/item/GDZPPN001248251}
}
Tamura, T.; Hamilton, H.B. Is minimal group congruence smallest?. Semigroup forum, Tome 4 (1972) pp. 173-176. http://gdmltest.u-ga.fr/item/GDZPPN001248251/