The light in the neighborhood of a caustic
Séminaire Bourbaki : vol. 1976/77, exposés 489-506, Séminaire Bourbaki, no. 19 (1978), Talk no. 490, p. 19-29
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     author = {Duistermaat, J. J.},
     title = {The light in the neighborhood of a caustic},
     booktitle = {S\'eminaire Bourbaki : vol. 1976/77, expos\'es 489-506},
     author = {Collectif},
     series = {S\'eminaire Bourbaki},
     publisher = {Springer-Verlag},
     number = {19},
     year = {1978},
     note = {talk:490},
     pages = {19-29},
     zbl = {0401.35063},
     mrnumber = {521757},
     language = {en},
     url = {http://www.numdam.org/item/SB_1976-1977__19__19_0}
}
Duistermaat, J. J. The light in the neighborhood of a caustic, in Séminaire Bourbaki : vol. 1976/77, exposés 489-506, Séminaire Bourbaki, no. 19 (1978), Talk no. 490, pp. 19-29. http://www.numdam.org/item/SB_1976-1977__19__19_0/

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