4[1]Koh K M,Teo K L. The search for chromatically unique graphs[J]. Graphs and Combinatorics, 1990,6:259-285
5[2]Ruying Liu. Adjoint polynomials and chromatically unique graphs[J].Discrete Math,1997,172:8592
6[3]Bondy J A,Murty U S R.Graph theory with applications[M]. Amsterdam:North-Holland publishingcompany, 1976, 1-17
7[4]Cvetkovic D M, Doob M, Gutman I,Torgasev A. Recent result in the theory of graph spectra[M].Amsterdam: North-Holland publishing comply, 1988, 103 - 113
8[8]Cvetkovic D M, Doob M ,Sachs H. Spectra of graphs-theory and application[A]. VEB Deutscher Verlagder Wissenschaften[C]. Berlin. 1980
9[9]Cvetkovic D,Rowlinson P.The largest eigenvalue of a graph:A survey[J].Linear and Multilinear Algebra,1990,28:3-33
10[13]Biggs N. Algebraic graph theory[M]. Second Edition, London :Cambridge University Press,1993,49-50
