The composite character of the twenty-second Fermat number. - Vilmar Trevisan; João B. Carvalho (J. Supercomput., 1995)

A block algorithm for the Sylvester-observer equation arising in state-estimation. - João B. Carvalho; Biswa N. Datta (CDC, 2001)

An algorithm for generalized Sylvester-observer equation in state estimation of descriptor systems. - João B. Carvalho; Biswa N. Datta (CDC, 2002)

A new block algorithm for generalized Sylvester-observer equation and application to state estimation of vibrating systems. - João B. Carvalho; Biswa N. Datta (CDC, 2004)

Laplacian energy of diameter 3 trees. - Vilmar Trevisan; João B. Carvalho; Renata R. Del-Vecchio; Cybele T. M. Vinagre (Appl. Math. Lett., 2011)

A new algorithm for generalized Sylvester-observer equation and its application to state and velocity estimations in vibrating systems. - João B. Carvalho; Biswa N. Datta (Numer. Linear Algebra Appl., 2011)