A character approach to Looijenga's invariant theory for generalized root systems
Compositio Mathematica, Volume 55 (1985) no. 1, pp. 3-32.
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Slodowy, Peter. A character approach to Looijenga's invariant theory for generalized root systems. Compositio Mathematica, Volume 55 (1985) no. 1, pp. 3-32. http://archive.numdam.org/item/CM_1985__55_1_3_0/

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