Chaos in ecology: The topological entropy of a tritrophic food chain model. Duarte, Jorge; Januário, Cristina; Martins, Nuno — 2008 Discrete Dynamics in Nature and Society
K -theory for Cuntz-Krieger algebras arising from real quadratic maps. Martins, Nuno; Severino, Ricardo; Sousa Ramos, J. — 2003 International Journal of Mathematics and Mathematical Sciences