Geodesic
On propagation of singularities of solutions of initial-boundary value problems for first order hyperbolic systems.
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 17, Tome 147 (1985), pp. 138-149

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Some version of the lemma on finite speed of propagation of singularities is proved for the first order hyperbolic systems. This version was used in a number of papers devoted to spectral asymptotics for elliptic operators. 
@article{ZNSL_1985_147_a10,
     author = {Yu. G. Safarov},
     title = {On propagation of singularities of solutions of initial-boundary value problems for first order hyperbolic systems.},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {138--149},
     publisher = {mathdoc},
     volume = {147},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_147_a10/}
}
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Yu. G. Safarov. On propagation of singularities of solutions of initial-boundary value problems for first order hyperbolic systems.. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 17, Tome 147 (1985), pp. 138-149. http://geodesic.mathdoc.fr/item/ZNSL_1985_147_a10/