Bell, J., A. M. Garsia, and N. Wallach. “Some New Methods in the Theory of $m$-Quasi-Invariants”. The Electronic Journal of Combinatorics 11, no. 2 (August 30, 2005): R20. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v11i2r20.