“\begin{aligned} & \text { A } \mathbb{Z} \text {-BASIS OF THE } S_n \text {-INVARIANT SUBRING } \\ & \text { OF } \mathbb{Z}\left[a_i-a_j\right] \end{aligned}”. JP Journal of Algebra, Number Theory and Applications 64, no. 3 (March 31, 2025): 251–287. Accessed January 5, 2026. https://pphmjopenaccess.com/jpjana/article/view/2973.