An estimation formula for the average path length of scale-free networks
李旲, 曹宏铎, 山秀明, 任勇
An estimation formula for the average path length of scale-free networks
Li Ying(李旲), Cao Hong-Duo(曹宏铎), Shan Xiu-Ming(山秀明), and Ren Yong(任勇)
中国物理B . 2008, (7): 2327 -2332 .  DOI: 10.1088/1674-1056/17/7/001