Team, S. “All Maximal Clones of a Majority Reflexive Graph: Udom Chotwattakawanit, Chawewan Rattanaprasert”. Thai Journal of Mathematics, vol. 13, no. 1, Apr. 2015, pp. 63-68, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/491.