Commutative semigroups whose proper subsemigroups are projective.
Nordahl, T.E.
Semigroup forum, Tome 7 (1974), p. 35-41 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1974-01-01
EUDML-ID : urn:eudml:doc:133957 
@article{GDZPPN001248987,
     title = {Commutative semigroups whose proper subsemigroups are projective.},
     journal = {Semigroup forum},
     volume = {7},
     year = {1974},
     pages = {35-41},
     zbl = {0275.20105},
     url = {http://dml.mathdoc.fr/item/GDZPPN001248987}
}

Nordahl, T.E. Commutative semigroups whose proper subsemigroups are projective.. Semigroup forum, Tome 7 (1974) pp. 35-41. http://gdmltest.u-ga.fr/item/GDZPPN001248987/