Team, S. “Chromatic Uniqueness of Certain Bipartite Graphs With Six Edges Deleted: Yee-Hock Peng, Roslan Hasni”. Thai Journal of Mathematics, vol. 8, no. 2, Aug. 2010, pp. 339-54, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/204.