Difference hierarchy in $ǎrphi$–spaces. Selivanov, V. L. Algebra and Logic, 43(4):238–248, 2004.
bibtex   
@ARTICLE{Sel04a,
  author = {Selivanov, Victor L.},
  title = {Difference hierarchy in $\varphi$--spaces},
  journal = {Algebra and Logic},
  year = {2004},
  volume = {43},
  pages = {238--248},
  number = {4},
  file = {Sel04a.pdf:Sel04a.pdf:PDF}
}

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