@article{BSMF_1994__122_4_505_0,
     author = {Doebeli, Michael},
     title = {Linear models for reductive group actions on affine quadrics},
     journal = {Bulletin de la Soci\'et\'e Math\'ematique de France},
     pages = {505--531},
     publisher = {Soci\'et\'e math\'ematique de France},
     volume = {122},
     number = {4},
     year = {1994},
     doi = {10.24033/bsmf.2244},
     mrnumber = {95j:14066},
     zbl = {0819.14018},
     language = {en},
     url = {http://archive.numdam.org/articles/10.24033/bsmf.2244/}
}