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@INPROCEEDINGS{Dahmen:125825,
      author       = {Dahmen, Wolfgang},
      title        = {{T}rigonometric approximation with exponential error
                      orders. {III}. {C}riteria for asymptotically optimal
                      processes},
      address      = {Gdansk},
      reportid     = {RWTH-CONV-196267},
      year         = {1979},
      comment      = {Proc. of the International Conference on Approximation and
                      Function Spaces, ed. by Z. Ciesielski},
      booktitle     = {Proc. of the International Conference
                       on Approximation and Function Spaces,
                       ed. by Z. Ciesielski},
      cin          = {111410 / 110000},
      cid          = {$I:(DE-82)111410_20140620$ / $I:(DE-82)110000_20140620$},
      typ          = {PUB:(DE-HGF)8},
      url          = {https://publications.rwth-aachen.de/record/125825},
}