Symmetric $X_9$ Singularities and Complex Affine Reflection Groups
Informatics and Automation, Analysis and singularities. Part 1, Tome 258 (2007), pp. 49-57.

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We establish a natural correspondence between the finite order automorphisms of the function singularities $X_9$ and the complex crystallographic groups. A complete list of the related objects is obtained.
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V. V. Goryunov. Symmetric $X_9$ Singularities and Complex Affine Reflection Groups. Informatics and Automation, Analysis and singularities. Part 1, Tome 258 (2007), pp. 49-57. http://geodesic.mathdoc.fr/item/TRSPY_2007_258_a4/

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