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@article{MAN_1978__238_163192, author = {Klaus J\"anich}, title = {Symmetry {Properties} of {Singularities} of {C{\textdegree}{\textdegree}-Functions.}}, journal = {Mathematische Annalen}, pages = {147--156}, publisher = {mathdoc}, volume = {238}, year = {1978}, zbl = {0384.58011}, url = {http://geodesic.mathdoc.fr/item/MAN_1978__238_163192/} }
Klaus Jänich. Symmetry Properties of Singularities of C°°-Functions.. Mathematische Annalen, Tome 238 (1978), pp. 147-156. http://geodesic.mathdoc.fr/item/MAN_1978__238_163192/