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@article{PORMA_1985__43_2_114500, author = {Piziak, Robert}, title = {Orthogonality-preserving transformations on quadratic spaces}, journal = {Portugaliae mathematica}, pages = {201--212}, publisher = {mathdoc}, volume = {43}, number = {2}, year = {1985}, mrnumber = {0886667}, zbl = {0595.15001}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1985__43_2_114500/} }
Piziak, Robert. Orthogonality-preserving transformations on quadratic spaces. Portugaliae mathematica, Tome 43 (1985) no. 2, pp. 201-212. http://geodesic.mathdoc.fr/item/PORMA_1985__43_2_114500/