@article{JRAM_1987__378_152944,
     author = {Alexander Prestel},
     title = {On the size of zeros of quadratic forms over rational function fields.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {101--112},
     year = {1987},
     volume = {378},
     zbl = {0606.10014},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__378_152944/}
}