@article{RRACEFN_1998_1998_1_a2,
     author = {Ferrando, J.C. and  L\'opez Pellicer, M.},
     title = {El ideal de todos los subconjuntosde densidad cero de {N}},
     journal = {Revista de la Real Academia de Ciencias Exactas, F{\'\i}sicas y Naturales },
     pages = {21-25},
     publisher = {mathdoc},
     volume = {92},
     number = {1},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RRACEFN_1998_1998_1_a2/}
}