@article{10_4064_fm_48_1_1_14,
     author = {J. Nagata},
     title = {On the countable sum of zero-dimensional metric spaces},
     journal = {Fundamenta Mathematicae},
     pages = {1--14},
     publisher = {mathdoc},
     volume = {48},
     number = {1},
     year = {1959},
     doi = {10.4064/fm-48-1-1-14},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-48-1-1-14/}
}