PaperOn the distance matrix of a directed graphR.L. Graham, A.J. Hoffman, et al.Journal of Graph Theory
PaperOn bounds for eigenvalues of real symmetric matricesE.R. Barnes, A.J. HoffmanLinear Algebra and Its Applications
PaperOn graphs whose least eigenvalue exceeds - 1 - √2A.J. HoffmanLinear Algebra and Its Applications
PaperGeršgorin variations III: On a theme of Brualdi and VargaEndre Boros, Richard A. Brualdi, et al.Linear Algebra and Its Applications