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@article{SF_1974__6_133991, author = {Mati Kilp}, title = {Commutative monoids all of whose principal ideals are projective.}, journal = {Semigroup forum}, pages = {334--339}, publisher = {mathdoc}, volume = {6}, year = {1974}, zbl = {0267.20053}, url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133991/} }
Mati Kilp. Commutative monoids all of whose principal ideals are projective.. Semigroup forum, Tome 6 (1974), pp. 334-339. http://geodesic.mathdoc.fr/item/SF_1974__6_133991/