@article{EXMATH_1991_1991_1_a14,
     author = {Alonso, Javier and Ull\'an, Antonio},
     title = {M\'odulos d\'ebiles de convexidad.},
     journal = {Extracta mathematicae},
     pages = {47-49},
     publisher = {mathdoc},
     volume = {6},
     number = {1},
     year = {1991},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1991_1991_1_a14/}
}