@article{GDZPPN002194996,
title = {The number of zeroes of x3 + y3 + cz3 in certain finite fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {302},
year = {1978},
pages = {406-410},
zbl = {0369.10011},
url = {http://dml.mathdoc.fr/item/GDZPPN002194996}
}
Chowla, S.; Cowles, J.; Cowles, M. The number of zeroes of x3 + y3 + cz3 in certain finite fields.. Journal für die reine und angewandte Mathematik, Tome 302 (1978) pp. 406-410. http://gdmltest.u-ga.fr/item/GDZPPN002194996/