@ARTICLE{HMRS00,
  author  = {Theo Härder and Wolfgang Mahnke and Norbert Ritter and Hans-Peter Steiert},
  title   = {Generating Versioning Facilities for a Design-Data Repository Supporting Cooperative Applications},
  journal = {Int. Journal of Intelligent & Cooperative Information Systems},
  year    = {2000},
  volume  = {9},
  number  = {1-2},
  pages   = {117-146}
}