@inproceedings{CaGP10c,
  title = "Query Answering under Expressive {E}ntity-{R}elationship Schemata",
  author = "Cal\`{\i}, Andrea and Gottlob, Georg and Pieris, Andreas",
  year = "2010",
  booktitle = "Proceeding of the 29th International Conference on Conceptual Modeling (ER)",
  pages = "347--361",
}