Vichitkunakorn, Panupong. “Solutions to the T-Systems With Principal Coefficients”. The Electronic Journal of Combinatorics 23, no. 2 (June 10, 2016): #P2.44. Accessed May 15, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v23i2p44.