A classification of the nilpotent triangular matrices
Compositio Mathematica, Tome 55 (1985) no. 1, pp. 89-133.
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     number = {1},
     year = {1985},
     mrnumber = {791648},
     zbl = {0579.15011},
     language = {en},
     url = {http://archive.numdam.org/item/CM_1985__55_1_89_0/}
}
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Hesselink, Wim H. A classification of the nilpotent triangular matrices. Compositio Mathematica, Tome 55 (1985) no. 1, pp. 89-133. http://archive.numdam.org/item/CM_1985__55_1_89_0/

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