@article{EXMATH_1997_1997_1_a8,
     author = {Allali, K. and Taa, A.},
     title = {Caracterizaci\'on de la derivabilidad de las funciones a partir de la derivada direccional.},
     journal = {Extracta mathematicae},
     pages = {1-13},
     publisher = {mathdoc},
     volume = {12},
     number = {1},
     year = {1997},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1997_1997_1_a8/}
}