Note on graphs and weakly cyclic matrices. - E. Marques De Sá (Discret. Math., 1981)

Multiple roots of diagonal multiples of a square matrix. - E. Marques De Sá (Discret. Math., 1981)

On the Similarity Invariant Polynomials of Matrices and Principal Submatrices. - E. Marques De Sá; João David Vieira (SIAM J. Matrix Anal. Appl., 2001)

Fibonacci numbers, alternating parity sequences and faces of the tridiagonal Birkhoff polytope. - Carlos M. da Fonseca; E. Marques De Sá (Discret. Math., 2008)