Geodesic
Commutative semigroups whose proper subsemigroups are projective.
Semigroup forum, Tome 6 (1974), pp. 35-41.

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@article{SF_1974__6_133957,
     author = {T.E. Nordahl},
     title = {Commutative semigroups whose proper subsemigroups are projective.},
     journal = {Semigroup forum},
     pages = {35--41},
     publisher = {mathdoc},
     volume = {6},
     year = {1974},
     zbl = {0275.20105},
     url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133957/}
}
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%D 1974
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%I mathdoc
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T.E. Nordahl. Commutative semigroups whose proper subsemigroups are projective.. Semigroup forum, Tome 6 (1974), pp. 35-41. http://geodesic.mathdoc.fr/item/SF_1974__6_133957/