@article{gonzalez2007r,
  title={When is R the union of an increasing family of null sets?},
  author={Gonz{\'a}lez-Hern{\'a}ndez, Juan and Hern{\'a}ndez-Hern{\'a}ndez, Fernando and Villarreal, C{\'e}sar E},
  journal={Commentationes Mathematicae Universitatis Carolinae},
  volume={48},
  number={4},
  pages={623--630},
  year={2007},
  publisher={Universitas Carolina}, 
   keywords = {pisis}
}

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