@INPROCEEDINGS{zirpins:acp-01,
  author       = {Christian Zirpins and Harald Weinreich and Andreas Bartelt and Winfried Lamersdorf},
  title        = {Advanced Concepts for Next Generation Portals},
  booktitle    = {12th International Workshop on Database and Expert Systems Applications},
  year         = {2001},
  editor       = {A.M. Tjoa and R.R. Wagner},
  pages        = {501-506},
  month        = {9},
  organization = {IEEE Computer Society},
  publisher    = {IEEE Computer Society Los Alamos, California}
}