@article{1103039107,
author = {Cohen, Eckford},
title = {A class of residue systems (mod $r$) and related arithmetical functions. II. Higher dimensional analogues.},
journal = {Pacific J. Math.},
volume = {9},
number = {4},
year = {1959},
pages = { 667-679},
language = {en},
url = {http://dml.mathdoc.fr/item/1103039107}
}
Cohen, Eckford. A class of residue systems (mod $r$) and related arithmetical functions. II. Higher dimensional analogues.. Pacific J. Math., Tome 9 (1959) no. 4, pp. 667-679. http://gdmltest.u-ga.fr/item/1103039107/