Nonlinear effectively hyperbolic equations
Séminaire Équations aux dérivées partielles (Polytechnique), (1985-1986), Talk no. 12, 7 p.
@article{SEDP_1985-1986____A12_0,
     author = {Iwasaki, N.},
     title = {Nonlinear effectively hyperbolic equations},
     journal = {S\'eminaire \'Equations aux d\'eriv\'ees partielles (Polytechnique)},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     year = {1985-1986},
     note = {talk:12},
     zbl = {0609.35060},
     mrnumber = {874571},
     language = {en},
     url = {http://www.numdam.org/item/SEDP_1985-1986____A12_0}
}
Iwasaki, N. Nonlinear effectively hyperbolic equations. Séminaire Équations aux dérivées partielles (Polytechnique),  (1985-1986), Talk no. 12, 7 p. http://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. | MR 602181 | Zbl 0331.35020

[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 882375