@article{AIF_1998__48_3_769_0,
     author = {Kurdyka, Krzysztof},
     title = {On gradients of functions definable in o-minimal structures},
     journal = {Annales de l'Institut Fourier},
     pages = {769--783},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {48},
     number = {3},
     year = {1998},
     doi = {10.5802/aif.1638},
     mrnumber = {2000b:03139},
     zbl = {0934.32009},
     language = {en},
     url = {http://www.numdam.org/articles/10.5802/aif.1638/}
}