A. Abdollahi, S. Janbaz and M. R. Oboudi (2013). Graphs cospectral with a friendship graph or its complement. Trans. Comb.. 2 (4), 37-52
S. M. Cioaba, W. H. Haemers, J. Vermette and W. Wong (2013). The graphs with all but two eigenvalues equal to 1. http://arxiv.org/pdf/1310.6529v1.pdf.
K. C. Das (2013). Proof of conjectures on adjacency eigenvalues of graphs. Discrete Math.. 313, 19-25
Y. Hong, J. Shu and K. Fang (2001). A sharp upper bound of the spectral radius of graphs. J. Combin. Theory Ser. B. 81, 177-183
J. F. Wang, F. Belardo, Q. X. Huang and B. Borovicanin (2010). On the two largest Q-eigenvalues of graphs. Discrete Math.. 310, 2858-2866
J. F. Wang, H. Zhao and Q. Huang (2012). Spectral characterization of multicone graphs. Czech. Math. J.. 62 (137), 117-126