Hyperbolic equations and irregularity
Séminaire Goulaouic-Schwartz (1980-1981), Exposé no. 9 bis, 16 p. 
@article{SEDP_1980-1981____A11_0,
     author = {Komatsu, H.},
     title = {Hyperbolic equations and irregularity},
     journal = {S\'eminaire Goulaouic-Schwartz},
     note = {talk:9 bis},
     pages = {1--16},
     year = {1980-1981},
     publisher = {Ecole Polytechnique, Centre de Math\'ematiques},
     zbl = {0497.35060},
     language = {en},
     url = {https://www.numdam.org/item/SEDP_1980-1981____A11_0/}
}
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Komatsu, H. Hyperbolic equations and irregularity. Séminaire Goulaouic-Schwartz (1980-1981), Exposé no. 9 bis, 16 p.. https://www.numdam.org/item/SEDP_1980-1981____A11_0/

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