1. Yumei Hu,Tianyi Xu, Bicyclic graphs with minimum general Randic index, MATCH Communications in Mathematical and in Computer Chemistry, 60 (2008), 585-600. SCI. IDS Number: 356FX。
2. Yumei Hu, Trees with second and third minimum general Randic index, Mathematical Chemistry Monographs, 2008. 161-166。
3. Yumei Hu, Xueliang Li, Yongtang Shi and Tianyi Xu, Connected (n,m)-graphs with minimum and maximum zeroth-order general Randic index, Discrete Applied Mathematic 155 (2007), 1044-1054. SCI.IDS Number:171PR。