Team, Support. “On the Graph Relabeling Problem: Geir Agnarsson, Raymond Greenlaw, Sanpawat Kantabutra”. Thai Journal of Mathematics 8, no. 1 (April 1, 2010): 21–42. Accessed April 29, 2024. https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/178.