no. 1
Homogeneous varieties for semisimple groups of rank one
Compositio Mathematica, Tome 98 (1995) no. 1, pp. 77-89. 
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     author = {Knop, Friedrich},
     title = {Homogeneous varieties for semisimple groups of rank one},
     journal = {Compositio Mathematica},
     pages = {77--89},
     publisher = {Kluwer Academic Publishers},
     volume = {98},
     number = {1},
     year = {1995},
     mrnumber = {1353286},
     zbl = {0860.14040},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1995__98_1_77_0/}
}
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Knop, Friedrich. Homogeneous varieties for semisimple groups of rank one. Compositio Mathematica, Tome 98 (1995) no. 1, pp. 77-89. http://archive.numdam.org/item/CM_1995__98_1_77_0/

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