Empirical investigation of topological and weighted properties of a bus transport network from China
Feng Shu-Min, Hu Bao-Yu†, , Nie Cen, Shen Xiang-Hao, Ci Yu-Sheng
       

(a) Relationship between in-degree and in-weight, with βin = 1.374; (b) relationship between out-degree and out-weight, with βout = 1.325.