Geodesic
On orbit spaces of finite and connected linear groups
Izvestiya. Mathematics , Tome 20 (1983) no. 1, pp. 97-101

Voir la notice de l'article provenant de la source Math-Net.Ru

Using geometric properties of the orbit space, the author gives a characterization of finite linear groups generated by reflections. Sufficient conditions that the module of covariants for a connected reductive group be free are indicated. Bibliography: 7 titles. 
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     title = {On orbit spaces of finite and connected linear groups},
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D. I. Panyushev. On orbit spaces of finite and connected linear groups. Izvestiya. Mathematics , Tome 20 (1983) no. 1, pp. 97-101. http://geodesic.mathdoc.fr/item/IM2_1983_20_1_a5/