@article{GDZPPN002208326,
title = {Theta series mod p and the basis problem for Nebentypus.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {416},
year = {1991},
pages = {131-140},
zbl = {0715.11020},
url = {http://dml.mathdoc.fr/item/GDZPPN002208326}
}
Ponomarev, Paul. Theta series mod p and the basis problem for Nebentypus.. Journal für die reine und angewandte Mathematik, Tome 416 (1991) pp. 131-140. http://gdmltest.u-ga.fr/item/GDZPPN002208326/