no. 1
A character approach to Looijenga's invariant theory for generalized root systems
Compositio Mathematica, Tome 55 (1985) no. 1, pp. 3-32. 
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     title = {A character approach to {Looijenga's} invariant theory for generalized root systems},
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     pages = {3--32},
     publisher = {Martinus Nijhoff Publishers},
     volume = {55},
     number = {1},
     year = {1985},
     mrnumber = {791645},
     zbl = {0609.20024},
     language = {en},
     url = {http://www.numdam.org/item/CM_1985__55_1_3_0/}
}
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Slodowy, Peter. A character approach to Looijenga's invariant theory for generalized root systems. Compositio Mathematica, Tome 55 (1985) no. 1, pp. 3-32. http://www.numdam.org/item/CM_1985__55_1_3_0/

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