Gouveia Jr, Josaphat Ricardo Ribeiro, Fabíolo Moraes Amaral, and Luís Fernando Costa Alberto. 2016. “Subcritical Hopf Equilibrium Points in Boundary of the Stability Region”. Trends in Computational and Applied Mathematics 17 (2):211. https://doi.org/10.5540/tema.2016.017.02.0211.