Monzillo, Giusy, and Safet Penjić. “On Commutative Association Schemes and Associated (Directed) Graphs”. The Electronic Journal of Combinatorics 32, no. 1 (March 28, 2025): P1.54. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v32i1p54.