Team, Support. “Properties of Graph Which Satisfy Equations S ≈ T Where S, T Are (x(yz))z Terms of Type (2,0): J. Khumpakdee, T. Poomsa-Ard”. Thai Journal of Mathematics 10, no. 2 (August 1, 2012): 383–400. Accessed May 15, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/326.