@INPROCEEDINGS{PanseRitter2009,
  author    = {Fabian Panse and Norbert Ritter},
  title     = {Completeness in Databases with Maybe-Tuples},
  booktitle = {Proceedings of the 4th Workshop on Quality of Information Systems at ER 2009},
  year      = {2009},
  editor    = {Carlos A. Heuser and Günther Pernul},
  volume    = {5833},
  series    = {Lecture Notes in Computer Science},
  pages     = {202-211},
  month     = {11},
  publisher = {Springer Heidelberg},
  note      = {Advances in Conceptual Modeling - ER Workshops}
}