BV solutions for a class of viscous hyperbolic systems Stefano BianchiniAlberto Bressan 35K4035L65Hyperbolic systemvanishing viscosityCauchy problemLipschitz continous semigroupReimann SolverRiemann manifold Indiana University Mathematics Journal 2000 text pdf 10.1512/iumj.2000.49.1776 10.1512/iumj.2000.49.1776 en Indiana Univ. Math. J. 49 (2000) 1673 - 1714 state-of-the-art mathematics http://iumj.org/access/