Invers SEMIGROUPS ON GRAPHS.
Hall, T.E. ; Ash, C.J.
Semigroup forum, Tome 11 (1975), p. 140-145 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1975-01-01
EUDML-ID : urn:eudml:doc:134135 
@article{GDZPPN001250922,
     title = {Invers SEMIGROUPS ON GRAPHS.},
     journal = {Semigroup forum},
     volume = {11},
     year = {1975},
     pages = {140-145},
     zbl = {0334.20043},
     url = {http://dml.mathdoc.fr/item/GDZPPN001250922}
}

Hall, T.E.; Ash, C.J. Invers SEMIGROUPS ON GRAPHS.. Semigroup forum, Tome 11 (1975) pp. 140-145. http://gdmltest.u-ga.fr/item/GDZPPN001250922/