The change in eigenvalue multiplicity associated with perturbation of a diagonal entry
(with C. R. Johnson and C. Saiago)
", Linear and Multilinear Algebra 60 (2012)
Imbedding conditions for normal matrices
(with J. F. Queiró)
", Linear Algebra Appl. 430 (2009)
The structure of matrices with a maximum multiplicity eigenvalue
(with C. R. Jonhson and C. Saiago)
", Linear Algebra Appl. 429 (2008)
Multiplicity Lists for the Eigenvalues of Symmetric Matrices with a Given Graph
(with C. R. Jonhson, Carlos Saiago)
, in: Handbook of Linear Algebra (ISBN: 978-1-58488-51), pp. Chap 34 , Discrete Mathematics and its Applications , CRC Press, 2007
Converse to the Parter-Wiener Theorem: the case of non-trees
(with C. R. Jonhson)
", Discrete Math. 306 (2006)
PhD Students
José Monteiro da Rocha, mathematian and astronomer
co-supervision with Prof. Artur Alves (Univ de Coimbra) e Prof. João Fernandes (Univ de Coimbra), 2011
Symmetric band matrices and Fiedler characterization
2006