@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/