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@article{CMH_1995__70_3_140370, author = {Friedrich Knop}, title = {On the set of orbits for a {Borel} subgroup.}, journal = {Commentarii mathematici Helvetici}, pages = {285--309}, publisher = {mathdoc}, volume = {70}, number = {3}, year = {1995}, zbl = {0828.22016}, url = {http://geodesic.mathdoc.fr/item/CMH_1995__70_3_140370/} }
Friedrich Knop. On the set of orbits for a Borel subgroup.. Commentarii mathematici Helvetici, Tome 70 (1995) no. 3, pp. 285-309. http://geodesic.mathdoc.fr/item/CMH_1995__70_3_140370/