The space of ultrafilters on N covered by nowhere dense sets

@article{Balcar1980TheSO,
  title={The space of ultrafilters on N covered by nowhere dense sets},
  author={Bohuslav Balcar and Jan Pelant and Petr Simon},
  journal={Fundamenta Mathematicae},
  year={1980},
  volume={110},
  pages={11-24}
}
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