Geodesic
On the number of semigroups of natural numbers.
Mathematica Scandinavica, Tome 66 (1990) no. 1, pp. 197-215.

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Mots-clés : addition of sets, Frobenius number 
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Jörgen Backelin. On the number of semigroups of natural numbers.. Mathematica Scandinavica, Tome 66 (1990) no. 1, pp. 197-215. http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167105/