@article{EXMATH_1989_1989_1_a16,
     author = {Ben-El-Mechaiekh, H.},
     title = {Puntos fijos para composiciones de aplicaciones que toman valores sobre conjuntos},
     journal = {Extracta mathematicae},
     pages = {93-95},
     publisher = {mathdoc},
     volume = {4},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1989_1989_1_a16/}
}