@article{EXMATH_1990_1990_1_a3,
     author = {Banas, Jozef and Martin\'on, Antonio},
     title = {Algunas propiedades de la distancia de {Hausdorff} en espacios m\'etricos.},
     journal = {Extracta mathematicae},
     pages = {9-11},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {1990},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1990_1990_1_a3/}
}