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@article{MAN_1974__209_162593, author = {Klaus J\"anich}, title = {Caustics and {Catastrophes.}}, journal = {Mathematische Annalen}, pages = {161--180}, publisher = {mathdoc}, volume = {209}, year = {1974}, zbl = {0268.58005}, url = {http://geodesic.mathdoc.fr/item/MAN_1974__209_162593/} }
Klaus Jänich. Caustics and Catastrophes.. Mathematische Annalen, Tome 209 (1974), pp. 161-180. http://geodesic.mathdoc.fr/item/MAN_1974__209_162593/