@article{GDZPPN00219094X,
title = {The number of k-free divisors of an integer. II.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {272},
year = {1975},
pages = {200-205},
zbl = {0303.10043},
url = {http://dml.mathdoc.fr/item/GDZPPN00219094X}
}
Suryanarayana, D.; Prasad, V. Siva Rama. The number of k-free divisors of an integer. II.. Journal für die reine und angewandte Mathematik, Tome 272 (1975) pp. 200-205. http://gdmltest.u-ga.fr/item/GDZPPN00219094X/