Well-posedness and propagation of singularities for initial boundary value problem for second order hyperbolic equation with general boundary condition
Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1979-1980), Exposé no. 2, 14 p. 
@article{SEDP_1979-1980____A2_0,
     author = {Eskin, G.},
     title = {Well-posedness and propagation of singularities for initial boundary value problem for second order hyperbolic equation with general boundary condition},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique) dit aussi "S\'eminaire Goulaouic-Schwartz"},
     note = {talk:2},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1979-1980},
     mrnumber = {600686},
     language = {en},
     url = {www.numdam.org/item/SEDP_1979-1980____A2_0/}
}
Eskin, G. Well-posedness and propagation of singularities for initial boundary value problem for second order hyperbolic equation with general boundary condition. Séminaire Équations aux dérivées partielles (Polytechnique) dit aussi "Séminaire Goulaouic-Schwartz" (1979-1980), Exposé no. 2, 14 p. http://www.numdam.org/item/SEDP_1979-1980____A2_0/

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