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@article{MM2_1994__83_3-4_155954, author = {Paul Yiu}, title = {Quadratic forms between {Euclidean} {Spheres.}}, journal = {Manuscripta mathematica}, pages = {171--182}, publisher = {mathdoc}, volume = {83}, number = {3-4}, year = {1994}, zbl = {0810.11021}, url = {http://geodesic.mathdoc.fr/item/MM2_1994__83_3-4_155954/} }
Paul Yiu. Quadratic forms between Euclidean Spheres.. Manuscripta mathematica, Tome 83 (1994) no. 3-4, pp. 171-182. http://geodesic.mathdoc.fr/item/MM2_1994__83_3-4_155954/