@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} }