@article{00179256,
title = {An identity for a class of arithmetical functions of several variables.},
journal = {International Journal of Mathematics and Mathematical Sciences},
volume = {16},
year = {1993},
pages = {355-358},
doi = {10.1155/S0161171293000432},
zbl = {0774.11007},
language = {en},
url = {http://dml.mathdoc.fr/item/00179256}
}
Haukkanen, Pentti. An identity for a class of arithmetical functions of several variables.. International Journal of Mathematics and Mathematical Sciences, Tome 16 (1993) pp. 355-358. doi : 10.1155/S0161171293000432. http://gdmltest.u-ga.fr/item/00179256/