@article{JRAM_1978__0299_0300_152012,
     author = {S. Chowla and J. Cowles and M. Cowles},
     title = {The number of zeroes of x3 + y3 + cz3 in certain finite fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {406--410},
     publisher = {mathdoc},
     volume = {0299_0300},
     year = {1978},
     zbl = {0369.10011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1978__0299_0300_152012/}
}