@article{1103052189,
author = {Beaumont, Ross A. and Zuckerman, H. S.},
title = {A characterization of the subgroups of the additive rationals.},
journal = {Pacific J. Math.},
volume = {1},
number = {1},
year = {1951},
pages = { 169-177},
language = {en},
url = {http://dml.mathdoc.fr/item/1103052189}
}
Beaumont, Ross A.; Zuckerman, H. S. A characterization of the subgroups of the additive rationals.. Pacific J. Math., Tome 1 (1951) no. 1, pp. 169-177. http://gdmltest.u-ga.fr/item/1103052189/