@article {MR2599912,
AUTHOR = {Coron, Jean-Michel and Glass, Oliver and Wang, Zhiqiang},
TITLE = {Exact boundary controllability for 1-{D} quasilinear hyperbolic systems with a vanishing characteristic speed},
JOURNAL = {SIAM J. Control Optim.},
FJOURNAL = {SIAM Journal on Control and Optimization},
VOLUME = {48},
YEAR = {2009/10},
NUMBER = {5},
PAGES = {3105--3122},
ISSN = {0363-0129},
MRCLASS = {93B05 (35L50 35L60 49J20 93C20)},
MRNUMBER = {2599912},
DOI = {10.1137/090749268},
URL = {http://dx.doi.org/10.1137/090749268}, }