@article{GDZPPN002195240,
title = {Multiplicative even functions (mod r). I Structural properties.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {302},
year = {1978},
pages = {32-43},
zbl = {0376.10006},
url = {http://dml.mathdoc.fr/item/GDZPPN002195240}
}
Sivaramakrishnan, R. Multiplicative even functions (mod r). I Structural properties.. Journal für die reine und angewandte Mathematik, Tome 302 (1978) pp. 32-43. http://gdmltest.u-ga.fr/item/GDZPPN002195240/