Ordering Cacti With n Vertices and k Cycles by Their Laplacian Spectral Radii Shu-Guang Guo; Yan-Feng Wang — 2012 Publications de l'Institut Mathématique
On the spectral radius of bicyclic graphs M. Petrović; I. Gutman; Shu-Guang Guo — 2005 Bulletin, Classe des Sciences Mathématiques et Naturelles, Sciences mathématiques