Maikel M. Bosschaert, Sebastiaan G. Janssens, Yuri A. Kuznetsov. Switching to Nonhyperbolic Cycles from Codimension Two Bifurcations of Equilibria of Delay Differential Equations. SIAM J. Applied Dynamical Systems, 19(1):252-303, 2020. [doi]
Abstract is missing.