P. Stelter and W. Sextro, “Bifurcations in Dynamic Systems with Dry Friction,” in Bifurcation and Chaos: Analysis, Algorithms, Applications, vol. 97, R. Seydel, F. W. Schneider, T. Küpper, and H. Troger, Eds. Birkhäuser Basel, 1991, pp. 343–347.