@article{gouveia jr_amaral_alberto_2016,  title={Subcritical Hopf Equilibrium Points in the Boundary of the Stability Region},  volume={17},  ISSN={2179-8451},  url={https://doi.org/10.5540/tema.2016.017.02.0211},  DOI={10.5540/tema.2016.017.02.0211},  number={2},  journal={TEMA (São Carlos)},  publisher={Sociedade Brasileira de Matemática Aplicada e Computacional},  author={GOUVEIA Jr, J.R.R. and AMARAL, F.M. and ALBERTO, L.F.C.},  year={2016},  month={May},  pages={211–224} }