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Research partially supported by the Institut des Hautes Etudes Scientifiques, Bures-sur-Yvette, France
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Looijenga, E. Invariant theory for generaized root systems. Invent Math 61, 1–32 (1980). https://doi.org/10.1007/BF01389892
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DOI: https://doi.org/10.1007/BF01389892