@INPROCEEDINGS{R97,
  author    = {Norbert Ritter},
  title     = {Group-Authoring in CONCORD: A DB-based Approach},
  booktitle = {Proc.12th Annual ACM Symposium on Applied Computing (SAC'97)},
  year      = {1997},
  pages     = {158-165},
  month     = {2}
}