* '''<font color="#ff8000">哈塞图 Hasse diagram</font>''',一种专门用于部分顺序的图形绘制<ref>Di Battista et al. (1994), pp. 15–16, and Chapter 6, "Flow and Upward Planarity", pp. 171–214; Freese (2004).</ref> | * '''<font color="#ff8000">哈塞图 Hasse diagram</font>''',一种专门用于部分顺序的图形绘制<ref>Di Battista et al. (1994), pp. 15–16, and Chapter 6, "Flow and Upward Planarity", pp. 171–214; Freese (2004).</ref> |