Identify the diversity of mesoscopic structures in networks: A mixed random walk approach Yifang Ma, Xin Jiang, Meng Li, Xin Shen, Quantong Guo, Yanjun Lei and Zhiming Zheng EPL, 104 1 (2013) 18006 Published online: 15 November 2013 DOI: 10.1209/0295-5075/104/18006