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@article{CMH_1982__57_139914, author = {M.-A. Knus and R. Parimala and M. Ojanguren}, title = {Positive-definite quadratic bundles over the plane.}, journal = {Commentarii mathematici Helvetici}, pages = {400--411}, publisher = {mathdoc}, volume = {57}, year = {1982}, zbl = {0507.14010}, url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139914/} }
M.-A. Knus; R. Parimala; M. Ojanguren. Positive-definite quadratic bundles over the plane.. Commentarii mathematici Helvetici, Tome 57 (1982), pp. 400-411. http://geodesic.mathdoc.fr/item/CMH_1982__57_139914/