\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}. JPJANA [Internet]. 2025 Mar. 31 [cited 2026 Jan. 5];64(3):251-87. Available from: https://pphmjopenaccess.com/jpjana/article/view/2973