@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/}
}