@article{CRMATH_2002__334_3_189_0,
     author = {Thierry Gaspari},
     title = {The range of the derivative of a differentiable bump},
     journal = {Comptes Rendus. Math\'ematique},
     pages = {189--194},
     publisher = {Elsevier},
     volume = {334},
     number = {3},
     year = {2002},
     doi = {10.1016/S1631-073X(02)02223-9},
     language = {en},
}