@article{5639,
  author       = {Cottin, Claudia},
  issn         = {1432-1823},
  journal      = {Mathematische Zeitschrift},
  number       = {1},
  pages        = {69--83},
  publisher    = {Springer Science and Business Media LLC},
  title        = {{Mixed K-functionals: A measure of smoothness for blending-type approximation}},
  doi          = {10.1007/BF02570860},
  volume       = {204},
  year         = {1990},
}