@article{JRAM_1973__261_151332,
     author = {D. Suryanarayana and R.S.R.C. Rao},
     title = {Uniform {O-estimate} for k-free integers.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {146--152},
     publisher = {mathdoc},
     volume = {261},
     year = {1973},
     zbl = {0261.10032},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1973__261_151332/}
}