Hosoya H.Topological index.A newly proposed quantity characterizing the topological nature of structural isomers of saturatal hydrolarhons [J].Bull Chem Soc Jpn,1971,44:2332-2339.

Gutman I.Extremal hexagonal chains[J].Math Chem,1993,12:197-210.

Zhang L,Tian F.Extremal catacondensed benzenoids[J].Math Chem,2003,34:111-122.

Gutman I,Polansky O E.Mathematical Concepts in Organic Chemistry[M].Berlin:Springer-verlag,1986.

Hou Y.On acyclic systems with minimal Hosoya index[J].Discrete Appl Mathr,2002,119:251-257.

Yu A,Tian F.A kind of graphs with minimal Hosoya indices and maximal Merrifield-Simmons indices[J].MATCH Commun Math Comput Chem,2006,55(1):103-118.

Li S,Li X,Zhu Z.On minimal energy and Hosoya index ofunicyclic graphs[J].MATCH Commun Math Comput Chem,2009,61:325-339.

Yu A,Lv X.The Merrifield-Simmons indices and Hosoyaindices of trees with k pendent vertices[J].J Math Chem,2007,41(1):33-43.

Ou J.On extremal unicyclic molecular graphs with maximal Hosoya index[J].Discrete Appl Math,2009,157(2):391-397.

Ou J.On extremal unicyclic molecular graphswith prescribed girth and minimal Hosoya index[J].Math Chem,2007,42(3):423-432.

Wagner S.Exremal trees with respect to hosoyaindex and merrifield-simmons index[J].MATCH Commun Math Comput Chem,2007,57(1): 221-233.

Bondy J A,Murty.Graph Theory with Applications[M].New York:Macmillan,1976.

Liu H,Lu M.A unified approach to extremal cacti fordifferent indices[J].MATCH Commun Math Comput Chem,2007,58:193-204.

Liu H,Yan X,Yan Z.On the Merrifield-Simmons indices and Hosoya indices of trees with a prescribed diameter[J].MATCH Commun Math, Comput Chem,2007,57:371-384.

Deng H.The smallest Merrifield-Simmons index of(n,n+1)-graphs[J].Math Comput Model,2009,49(1-2):320-326.