Hòa, Vũ Đình, and Nguyễn Hữu Xuân Trường. “Hamilton Cycle of Graph Sigma2 >= N”. <i>Journal of Computer Science and Cybernetics</i> 28, no. 2 (October 18, 2012): 153–160. Accessed February 23, 2026. https://vjs.ac.vn/jcc/article/view/2496.