@article{5636,
  author       = {Cottin, Claudia},
  issn         = {1420-9012},
  journal      = {Results in Mathematics},
  number       = {3-4},
  pages        = {211--221},
  publisher    = {Springer Science and Business Media LLC},
  title        = {{Directional K- Functionals}},
  doi          = {10.1007/BF03322331},
  volume       = {24},
  year         = {1993},
}

@article{5637,
  author       = {Cottin, Claudia},
  issn         = {2196-6753},
  journal      = {Analysis},
  number       = {1-2},
  pages        = {185--200},
  publisher    = {Walter de Gruyter GmbH},
  title        = {{Directional extensions of univariate operators and Boolean sum approximation}},
  doi          = {10.1524/anly.1993.13.12.185},
  volume       = {13},
  year         = {1993},
}

@inproceedings{5649,
  author       = {Cottin, Claudia and Gonska, Heinz H. },
  booktitle    = {Proceedings of the Second International Conference in Functional Analysis and Approximation Theory},
  location     = {Acquafredda di Maratea (Potenza)},
  title        = {{Simultaneous approximation and global smoothness preservation}},
  year         = {1993},
}