Geodesic
Quasi-Invariants of Dihedral Systems
Matematičeskie zametki, Tome 76 (2004) no. 5, pp. 776-791.

Voir la notice de l'article provenant de la source Math-Net.Ru

For two-dimensional Coxeter systems with arbitrary multiplicities, a basis of the module of quasi-invariants over the invariants is explicitly constructed. It is proved that the basis thus obtained consists of $m$-harmonic polynomials. Hence this generalizes earlier results of Veselov and the author for systems of constant multiplicity. 
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M. V. Feigin. Quasi-Invariants of Dihedral Systems. Matematičeskie zametki, Tome 76 (2004) no. 5, pp. 776-791. http://geodesic.mathdoc.fr/item/MZM_2004_76_5_a12/

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