@article{EXMATH_1990_1990_1_a13,
     author = {Fern\'andez Castillo, Jes\'us M. and Montalvo, Francisco},
     title = {Un contraejemplo en espacios semim\'etricos.},
     journal = {Extracta mathematicae},
     pages = {38-40},
     year = {1990},
     volume = {5},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EXMATH_1990_1990_1_a13/}
}