@article{PPN35397434X_0061+dmdlog19,
title = {Smoothly symmetrizable hyperbolic systems of partial differential equations.},
journal = {Mathematica Scandinavica},
volume = {61},
year = {1987},
pages = {262-275},
zbl = {0656.35080},
url = {http://dml.mathdoc.fr/item/PPN35397434X_0061+dmdlog19}
}
Hernquist, Dale Clarke. Smoothly symmetrizable hyperbolic systems of partial differential equations.. Mathematica Scandinavica, Tome 61 (1987) pp. 262-275. http://gdmltest.u-ga.fr/item/PPN35397434X_0061+dmdlog19/