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
Fernando José Bandeira Figueiredo José Monteiro da Rocha, mathematian and astronomer
co-supervision with Prof. Artur Alves (Univ de Coimbra) e Prof. João Fernandes (Univ de Coimbra), 2011
Américo Lopes Bento Symmetric band matrices and Fiedler characterization
2006
