Yoo, Meesue. “A Combinatorial Formula for the Hilbert Series of Bigraded $S_n$-Modules”. The Electronic Journal of Combinatorics 17, no. 1 (June 29, 2010): R93. Accessed March 30, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1r93.