@article{JRAM_1987__377_152935,
     author = {Reinhard Racke},
     title = {Uniqueness for first-order hyperbolic systems - with applications to secnd-order elliptic third-order and {Maxwell's} equations.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {187--196},
     publisher = {mathdoc},
     volume = {377},
     year = {1987},
     zbl = {0605.35051},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__377_152935/}
}