@article{10_4064_cm108_1_9,
     author = {M. Banister and J. Chaika and S. T. Chapman and W. Meyerson},
     title = {On the arithmetic of
arithmetical congruence monoids},
     journal = {Colloquium Mathematicum},
     pages = {105--118},
     publisher = {mathdoc},
     volume = {108},
     number = {1},
     year = {2007},
     doi = {10.4064/cm108-1-9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm108-1-9/}
}