A.R. Conn, Nick Gould, et al.
Mathematics of Computation
Let G be a graph, A(G) its adjacency matrix. We prove that, if the least eigenvalue of A(G) exceeds -1 - √2 and every vertex of G has large valence, then the least eigenvalue is at least -2 and G is a generalized line graph. © 1997.
A.R. Conn, Nick Gould, et al.
Mathematics of Computation
Chai Wah Wu
Linear Algebra and Its Applications
Michael Ray, Yves C. Martin
Proceedings of SPIE - The International Society for Optical Engineering
Shu Tezuka
WSC 1991