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. 2026;3(3):369-371. doi:10.5890/JVTSD.2019.09.008