Cvetkovi′c D,Doob M,Sachs H.Spectra of Graphs-Theory and Applications[M].Heidelberg:Leipzig,1995.

Bang S,Dam E,Koolen J.Spectral characterizations of the Hamming graphs[J].Linear Algebra Appl,2008,429:2678-2686.

Haemers W,Liu X,Zhang Y.Spectral characterizations of lollipop graphs[J].Linear Algebra Appl,2008 428:2415-2423.

Boulet R,Jouve B.The lollipop graph is determined by its spectrum[J].Electron J Combin,2008,15:74.

Wang J,Huang Q,Belardo F,Marzi M.A note on the spectral characterization of dumbbell graphs[J].Linear Algebra Appl,2009,437:1707-1714.

Lu P,Liu X,Yuan Z,Yong X.Spectral characterizations of sandglass graphs[J].Applied Mathematics Letters,2009,22:1225-1230.

Dam E,Haemers W.Which graphs are determined by their spectra?[J].Linear Algebra Appl,2003,373:241-272.

Godsil C,Royle G.Algebraic Graph Theory[M].Springer:New York,2001.

Omidi G.On a Laplacian spectral characterization of graphs of index less than 2[J].Linear Algebra and its Applications,2008,429:2724-2731.

Hoffman A,Smith J.On the spectral radii of topologically equivalent graphs[J].Recent Advances in Graph Theory,Academia Praha,1975:273-281.

Schwenk A.Computing the characteristic polynomial of a graph Graphs[J].Combin Notes Math,1974,406:153-172.

Ghareghani N,Omidi G,Tayfeh-Rezaie B,Spectral characterization of graphs with index at most2+√5[J].Linear Algebra and its Applications,2007,420:483-489.