On the exponent of r -regular primitive matrices. Bueno, M.I.; Furtado, S. — 2008 ELA. The Electronic Journal of Linear Algebra [electronic only]
Maximum exponent of Boolean circulant matrices with constant number of nonzero entries in their generating vector. Bueno, M.I.; Furtado, S.; Sherer, N. — 2009 The Electronic Journal of Combinatorics [electronic only]