@article{GDZPPN002231875, title = {Arithmetical semigroups I: direct factors.}, journal = {Manuscripta mathematica}, volume = {70}, year = {1991}, pages = {83-96}, zbl = {0723.11048}, url = {http://dml.mathdoc.fr/item/GDZPPN002231875} }
KNOPFMACHER, J.; Indlekofer, K.-H.; Warlimont, R. Arithmetical semigroups I: direct factors.. Manuscripta mathematica, Tome 70 (1991) pp. 83-96. http://gdmltest.u-ga.fr/item/GDZPPN002231875/