@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},
}