101 (3): 126–128. doi:10.1016/j.ipl.2006.09.001. 1 2 Cheng, Weiyi; Liu, Xiaoguang; Wang, Gang; Liu, Jing (October 2007). "最少比较排序问题中S（15）和S（19）的解决" [The results of S(15) and S(19) to minimum-comparison sorting problem]. Journal of Frontiers of Computer Science and Technology (in Chinese).