no. 1
Algorithmic orbit classification for some Borel group actions
Compositio Mathematica, Tome 61 (1987) no. 1, pp. 3-41. 
@article{CM_1987__61_1_3_0,
     author = {B\"urgstein, Hartmut and Hesselink, Wim H.},
     title = {Algorithmic orbit classification for some {Borel} group actions},
     journal = {Compositio Mathematica},
     pages = {3--41},
     publisher = {Martinus Nijhoff Publishers},
     volume = {61},
     number = {1},
     year = {1987},
     mrnumber = {879187},
     zbl = {0612.17005},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1987__61_1_3_0/}
}
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Bürgstein, Hartmut; Hesselink, Wim H. Algorithmic orbit classification for some Borel group actions. Compositio Mathematica, Tome 61 (1987) no. 1, pp. 3-41. http://archive.numdam.org/item/CM_1987__61_1_3_0/

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