Geodesic
Invers SEMIGROUPS ON GRAPHS.
Semigroup forum, Tome 11 (1975), pp. 140-145.

Voir la notice de l'article provenant de la source European Digital Mathematics Library

@article{SF_1975__11_134135,
     author = {T.E. Hall and C.J. Ash},
     title = {Invers {SEMIGROUPS} {ON} {GRAPHS.}},
     journal = {Semigroup forum},
     pages = {140--145},
     publisher = {mathdoc},
     volume = {11},
     year = {1975},
     zbl = {0334.20043},
     url = {http://geodesic.mathdoc.fr/item/SF_1975__11_134135/}
}
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T.E. Hall; C.J. Ash. Invers SEMIGROUPS ON GRAPHS.. Semigroup forum, Tome 11 (1975), pp. 140-145. http://geodesic.mathdoc.fr/item/SF_1975__11_134135/