Rhoades, Brendon, and Andrew Timothy Wilson. “Tail Positive Words and Generalized Coinvariant Algebras”. The Electronic Journal of Combinatorics 24, no. 3 (July 28, 2017): P3.21. Accessed March 29, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v24i3p21.