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A. Teufel, A. Steindl, H. Troger:
"Classification of Non-Smooth Bifurcations for a Friction Oscillator";
in: "Problems of Analytical Mechanics and Stability Theory", V.V. Kozlov et al. (Hrg.); PhysMathLit Publisher, Moscow, 2009, ISBN: 9785-94052-185-3, S. 161 - 175.

For planar Filippov systems, which are a certain class of piece-wise smooth systems,
a complete classification is given of all Codimension 1 bifurcations. Filippov systems are very
important in applications, because dry friction oscillators with one degree of freedom belong to
the class of planar Filippov systems.
We investigate which of the bifurcations listed in [8] occur for a one degree of freedom friction
oscillator, for which Stribeck´s friction law is stipulated, which on one hand is more complicated
than Coulomb´s law, because it depends on three parameters, but on the other hand is in better
agreement with experiments.