@article{05232992,
title = {Isotropy of quadratic spaces in finite and infinite dimension.},
journal = {Documenta Mathematica},
volume = {12},
year = {2007},
pages = {473-504},
zbl = {1231.11044},
language = {en},
url = {http://dml.mathdoc.fr/item/05232992}
}
Becher, Karim Johannes; Hoffmann, Detlev W. Isotropy of quadratic spaces in finite and infinite dimension.. Documenta Mathematica, Tome 12 (2007) pp. 473-504. http://gdmltest.u-ga.fr/item/05232992/