Silva VB, Vieira JP, Leonel ED. Addendum in `Silva, Vinícius B. et al., 2018, A new application of the normal form description to a N-dimensional dynamical systems attending the conditions of a Hopf bifurcation, Journal of Vibration Testing and System Dynamics, 2(3), 249-256’. JVTSD [Internet]. 2026 Aug. 17 [cited 2026 Aug. 17];3(3):369-71. Available from: https://lhscientificpublishing.com/index.php/jvtsd/article/view/210