Geodesic
Equivalences, a-semigroups and a-congruences.
Semigroup forum, Tome 49 (1994) no. 2, pp. 49-58.

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Mots-clés : lattice of equivalence relations, -semigroup, semigroup of selfmaps, -equivalence relation, -equivalences, smallest proper congruence, -congruences 
@article{SF_1994__49_2_135333,
     author = {H. Pei},
     title = {Equivalences, a-semigroups and a-congruences.},
     journal = {Semigroup forum},
     pages = {49--58},
     publisher = {mathdoc},
     volume = {49},
     number = {2},
     year = {1994},
     zbl = {0804.20046},
     url = {http://geodesic.mathdoc.fr/item/SF_1994__49_2_135333/}
}
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H. Pei. Equivalences, a-semigroups and a-congruences.. Semigroup forum, Tome 49 (1994) no. 2, pp. 49-58. http://geodesic.mathdoc.fr/item/SF_1994__49_2_135333/