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  publisher    = {Duncker & Humblot},
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  issn         = {0340-3254},
  journal      = {Mitteilungen aus der Arbeitsmarkt- und Berufsforschung},
  pages        = {. 494--497},
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  year         = {1988},
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  pages        = {95--108},
  title        = {{Notes on degree of approximation of B-continuous and B-differentiable functions.}},
  volume       = {4},
  year         = {1988},
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