Singularities of differentiable maps
Publications Mathématiques de l'IHÉS, Tome 33 (1967), pp. 21-57. 
@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://www.numdam.org/item/PMIHES_1967__33__21_0/}
}
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Boardman, John. M. Singularities of differentiable maps. Publications Mathématiques de l'IHÉS, Tome 33 (1967), pp. 21-57. http://www.numdam.org/item/PMIHES_1967__33__21_0/

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