The light in the neighborhood of a caustic
Séminaire Bourbaki : vol. 1976/77, exposés 489-506, Séminaire Bourbaki, no. 19 (1978), Exposé no. 490, 11 p. 
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Duistermaat, J. J. The light in the neighborhood of a caustic, dans Séminaire Bourbaki : vol. 1976/77, exposés 489-506, Séminaire Bourbaki, no. 19 (1978), Exposé no. 490, 11 p. http://archive.numdam.org/item/SB_1976-1977__19__19_0/

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[2] J.J. Duistermaat - Comm. Pure Appl. Math., 27(1974), 207-281. | MR | Zbl

[3] B. Malgrange - Ann. Sc. Ecole Norm. Sup., 4e série, tome 7 (1974), 405-430, Gauthier-Villars, Paris. | Numdam | MR | Zbl

[4] R. Melrose - Duke Math. J., 42(1975), 605-635. | MR | Zbl

[5] M. Taylor - Comm. Pure Appl. Math., 29(1976), 1-38. | MR