$L^1$ stability of patterns of non-interacting large shock waves Marta Lewicka 35L6535L45conservation lawsshock waves$L^1$ stabilitylarge BV data Indiana University Mathematics Journal 2000 text pdf 10.1512/iumj.2000.49.1899 10.1512/iumj.2000.49.1899 en Indiana Univ. Math. J. 49 (2000) 1515 - 1538 state-of-the-art mathematics http://iumj.org/access/