@article{GDZPPN002391708,
title = {A generalization of the ordered group of integers.},
journal = {Mathematische Zeitschrift},
volume = {78},
year = {1962},
pages = {21-31},
zbl = {0146.25802},
url = {http://dml.mathdoc.fr/item/GDZPPN002391708}
}
Venkataraman, R.; Sankaran, N. A generalization of the ordered group of integers.. Mathematische Zeitschrift, Tome 78 (1962) pp. 21-31. http://gdmltest.u-ga.fr/item/GDZPPN002391708/