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@article{PMIHES_1967__33__21_0, author = {Boardman, John. M.}, title = {Singularities of differentiable maps}, journal = {Publications Math\'ematiques de l'IH\'ES}, pages = {21--57}, publisher = {Institut des Hautes \'Etudes Scientifiques}, volume = {33}, year = {1967}, mrnumber = {231390}, zbl = {0165.56803}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PMIHES_1967__33__21_0/} }
Boardman, John. M. Singularities of differentiable maps. Publications Mathématiques de l'IHÉS, Tome 33 (1967), pp. 21-57. http://geodesic.mathdoc.fr/item/PMIHES_1967__33__21_0/