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@article{JRAM_1991__420_153352, author = {Wolfgang Willems and Peter Sin}, title = {G-invariant quadratic forms.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {45--60}, publisher = {mathdoc}, volume = {420}, year = {1991}, zbl = {0733.20002}, url = {http://geodesic.mathdoc.fr/item/JRAM_1991__420_153352/} }
Wolfgang Willems; Peter Sin. G-invariant quadratic forms.. Journal für die reine und angewandte Mathematik, Tome 420 (1991), pp. 45-60. http://geodesic.mathdoc.fr/item/JRAM_1991__420_153352/