@article{GDZPPN00220469X,
title = {On the size of zeros of quadratic forms over rational function fields.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {374},
year = {1987},
pages = {101-112},
zbl = {0606.10014},
url = {http://dml.mathdoc.fr/item/GDZPPN00220469X}
}
Prestel, Alexander. On the size of zeros of quadratic forms over rational function fields.. Journal für die reine und angewandte Mathematik, Tome 374 (1987) pp. 101-112. http://gdmltest.u-ga.fr/item/GDZPPN00220469X/