On a Normal-Form Analysis for a Class of Passive bipedal Walkers. - Petri T. Piiroinen; Harry Dankowicz; Arne B. Nordmark (Int. J. Bifurc. Chaos, 2001)

Sliding bifurcations: a Novel Mechanism for the Sudden Onset of Chaos in dry Friction oscillators. - Mario di Bernardo; Piotr Kowalczyk; Arne B. Nordmark (Int. J. Bifurc. Chaos, 2003)

Two-Parameter Discontinuity-Induced bifurcations of Limit Cycles: Classification and Open Problems. - Piotr Kowalczyk; Mario di Bernardo; Alan R. Champneys; Stephen John Hogan; Martin E. Homer; Petri T. Piiroinen; Yuri A. Kuznetsov; Arne B. Nordmark (Int. J. Bifurc. Chaos, 2006)

Bifurcations in Nonsmooth Dynamical Systems. - Mario di Bernardo; Chris J. Budd; Alan R. Champneys; Piotr Kowalczyk; Arne B. Nordmark; Gerard Olivar Tost; Petri T. Piiroinen (SIAM Rev., 2008)

Dynamics Beyond Dynamic Jam; Unfolding the Painlevé Paradox Singularity. - Arne B. Nordmark; Péter L. Várkonyi; Alan R. Champneys (SIAM J. Appl. Dyn. Syst., 2018)