OLIVEIRA, Henrique M. Invariance of bifurcation equations for high degeneracy bifurcations of non-autonomous periodic maps. Topological Methods in Nonlinear Analysis. Online. 1 June 2016. Vol. 47, no. 2, pp. 715 - 737. [Accessed 22 July 2024]. DOI 10.12775/TMNA.2016.031.