Silva, V.B., Vieira, J.P. and Leonel, E.D. (2026) “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’”, Journal of Vibration Testing and System Dynamics, 3(3), pp. 369–371. doi:10.5890/JVTSD.2019.09.008.