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

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Zbl
Mots-clés : addition of sets, Frobenius number 
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/
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     author = {J\"orgen Backelin},
     title = {On the number of semigroups of natural numbers.},
     journal = {Mathematica Scandinavica},
     pages = {197--215},
     year = {1990},
     volume = {66},
     number = {1},
     zbl = {0741.11006},
     url = {http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167105/}
}
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