Geodesic
Projectives in inverse semigroups.
Semigroup forum, Tome 26 (1983), pp. 167-190.

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Mots-clés : retract of free inverse semigroup, projective inverse semigroups, congruences on free inverse semigroups, free product, free semilattice 
@article{SF_1983__26_134601,
     author = {P.G. Trotter},
     title = {Projectives in inverse semigroups.},
     journal = {Semigroup forum},
     pages = {167--190},
     publisher = {mathdoc},
     volume = {26},
     year = {1983},
     zbl = {0509.20045},
     url = {http://geodesic.mathdoc.fr/item/SF_1983__26_134601/}
}
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P.G. Trotter. Projectives in inverse semigroups.. Semigroup forum, Tome 26 (1983), pp. 167-190. http://geodesic.mathdoc.fr/item/SF_1983__26_134601/