@article{10_4064_fm186_1_4,
     author = {V. V. Tkachuk},
     title = {Point-countable $\pi $-bases in first countable
 and similar spaces},
     journal = {Fundamenta Mathematicae},
     pages = {55--69},
     publisher = {mathdoc},
     volume = {186},
     number = {1},
     year = {2005},
     doi = {10.4064/fm186-1-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/fm186-1-4/}
}