@article{10_4171_dm_231,
     author = {Karim Johannes Becher and Detlev W. Hoffmann},
     title = {Isotropy of quadratic spaces in finite and infinite dimension},
     journal = {Documenta mathematica},
     pages = {473--504},
     year = {2007},
     volume = {12},
     doi = {10.4171/dm/231},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/231/}
}