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@article{MM2_1991__71_3_155606, author = {J. KNOPFMACHER and K.-H. Indlekofer and R. Warlimont}, title = {Arithmetical semigroups {I:} direct factors.}, journal = {Manuscripta mathematica}, pages = {83--96}, publisher = {mathdoc}, volume = {71}, number = {3}, year = {1991}, zbl = {0723.11048}, url = {http://geodesic.mathdoc.fr/item/MM2_1991__71_3_155606/} }
J. KNOPFMACHER; K.-H. Indlekofer; R. Warlimont. Arithmetical semigroups I: direct factors.. Manuscripta mathematica, Tome 71 (1991) no. 3, pp. 83-96. http://geodesic.mathdoc.fr/item/MM2_1991__71_3_155606/