Mean first-passage time for random walks on undirected networks Zhongzhi Zhang, Alafate Julaiti, Baoyu Hou, Hongjuan Zhang and Guanrong Chen Eur. Phys. J. B, 84 4 (2011) 691-697 Published online: 23 November 2011 DOI: 10.1140/epjb/e2011-20834-1