On the Borel class of the derived set operator: II. Cenzer, D. & Mauldin, R. D. Bull. Soc. Math. France, 111(4):367–372, 1983.
bibtex   
@ARTICLE{CM83,
  author = {Cenzer, Douglas and Mauldin, R. Daniel},
  title = {On the {B}orel class of the derived set operator: {II}},
  journal = {Bull. Soc. Math. France},
  year = {1983},
  volume = {111},
  pages = {367--372},
  number = {4}
}

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