@article{JRAM_1965__219_150694,
     author = {Koichi Yamamoto},
     title = {On {Gaussian} sums with biquadratic residue characters.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {200--213},
     year = {1965},
     volume = {219},
     zbl = {0133.29306},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1965__219_150694/}
}