@Article{         KSSW00-1,
  author        = {Martin Karsten and Jens Schmitt and Burkhard Stiller and
                  Lars Wolf},
  title         = {{Charging for packet-switched network communication -
                  motivation and overview -}},
  year          = {2000},
  month         = feb,
  journal       = {Computer Communications},
  volume        = {23},
  number        = {3},
  booktitle     = {},
  publisher     = {Elsevier Science},
  institution   = {},
  howpublished  = {},
  pages         = {290--302},
  note          = {ISSN 0140-3664},
  url           = {http://www.elsevier.nl/gej-ng/10/15/19/39/27/33/article.pdf}
  %url           = {http://www.kom.e-technik.tu-darmstadt.de/publications/abstracts/KSSW00-1.html}

}