Following the paper of Shimizu et al. (Phys Lett A 375:1566, 2011), we consider\nthe Bonhoeffer-van der Pol oscillator with non-autonomous periodic perturbation. We show\nthat the presence of mixed mode oscillations reported in that paper can be explained using\nthe geometric singular perturbation theory. The considered model can be re-written as a fourdimensional\n(locally three-dimensional) autonomous system, which under certain conditions\nhas a folded saddle-node singularity and additionally can be treated as a three time scale one.
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