Nonlinear effectively hyperbolic equations
Séminaire Goulaouic-Schwartz (1985-1986), Exposé no. 12, 7 p. 
@article{SEDP_1985-1986____A12_0,
     author = {Iwasaki, N.},
     title = {Nonlinear effectively hyperbolic equations},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:12},
     pages = {1--7},
     year = {1985-1986},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     mrnumber = {874571},
     zbl = {0609.35060},
     language = {en},
     url = {https://www.numdam.org/item/SEDP_1985-1986____A12_0/}
}
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Iwasaki, N. Nonlinear effectively hyperbolic equations. Séminaire Goulaouic-Schwartz (1985-1986), Exposé no. 12, 7 p.. https://www.numdam.org/item/SEDP_1985-1986____A12_0/

[1] L. Hörmander, The boundary problems of physical geodesy, Arch. Rat. Mech. Anal., 62 (1976), 1-52. | Zbl | MR

[2] N. Iwasaki, The strongly hyperbolic equation and its applications, to appear in Pattern and Wave (Studies math. appl.) North-Holland Publishing Company, 1986. | MR