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Steve Schecter, P. Szmolyan:
"Rarefactions in the Dafermos regularization of a system of conservation laws";
in: "ASC Report 27/2008", Vienna University of Technology, Wien, 2008, ISBN: 978-3-902627-01-8.

We construct self-similar solutions of the Dafermos regularization of a system
of conservation laws near structurally stable Riemann solutions composed of Lax shocks and
rarefactions, with all waves possibly large. The construction requires blowing up a manifold
of gain-of-stability turning points in a geometric singular perturbation problem, as well as
a new exchange lemma to deal with the remaining hyperbolic directions.

http://www.asc.tuwien.ac.at/preprint/2008/asc27x2008.pdf