On Putcha's Q-semigroups.
Varisco, A. ; Cherubini, Spoletini A.
Semigroup forum, Tome 18 (1979), p. 313-318 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1979-01-01
EUDML-ID : urn:eudml:doc:134361 
@article{GDZPPN001253557,
     title = {On Putcha's Q-semigroups.},
     journal = {Semigroup forum},
     volume = {18},
     year = {1979},
     pages = {313-318},
     zbl = {0429.20051},
     url = {http://dml.mathdoc.fr/item/GDZPPN001253557}
}

Varisco, A.; Cherubini, Spoletini A. On Putcha's Q-semigroups.. Semigroup forum, Tome 18 (1979) pp. 313-318. http://gdmltest.u-ga.fr/item/GDZPPN001253557/