@article{JRAM_1973__264_151385,
     author = {D. Suryanarayana and V. Siva Rama Pradas},
     title = {The number of k-free and k-ary divisors of m which are prime to n.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {56--75},
     publisher = {mathdoc},
     volume = {264},
     year = {1973},
     zbl = {0266.10039},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__264_151385/}
}