1. C. Abdulwahed, F. Verhulst, Recurrent canards producing relaxation oscillations. Chaos 31 (2021). https://doi.org/10.1063/5.0040726
2. V.I. Arnold, V.V. Kozlov, A.I. Neihstadt, Mathematical Aspects of Classical and Celestial Mechanics. Encyclopaedia of Mathematical Sciences, ed. by V.I. Arnold. Dynamical Systems III (Springer, 1988)
3. E. Doedel, A.R. Champneys, T.F. Fairgrieve, Yu.A. Kuznetsov, B. Sandstede, X.J. Wang, AUTO97: Continuation and Bifurcation Software for Ordinary Differential Equations (with Hom-Cont), silver edition (Concordia University, Montreal, Canada, 1997). Download versions at GifHub and SourceForge
4. T. Bakri, F. Verhulst, Bifurcations and quasi-periodic dynamics: torus breakdown. Z. Angew. Math. Phys. 65, 1053–1076 (2014)
5. T. Bakri, Y.A. Kuznetsov, F. Verhulst, Torus bifurcations in a mechanical system. J. Dyn. Diff. Equ. 27, 371–403 (2015)