A constructive analogue of the functions of the $n$th Baire class (Russian). Demuth, O. Comment. Math. Univ. Carolinae, 18(2):231–245, 1977.
bibtex   
@ARTICLE{Dem77,
  author = {Demuth, Osvald},
  title = {A constructive analogue of the functions of the $n$th {B}aire class
	({R}ussian)},
  journal = {Comment. Math. Univ. Carolinae},
  year = {1977},
  volume = {18},
  pages = {231--245},
  number = {2},
  keywords = {bib,rus}
}
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