@inproceedings{conf/icdt/KostylevB12,
  title = "Combining dependent annotations for relational algebra",
  author = "Egor V. Kostylev and Peter Buneman",
  year = "2012",
  booktitle = "Proceedings of the 15th International Conference on Database Theory ({ICDT} 2012), Berlin, Germany, March 26-29, 2012",
  pages = "196--207",
  publisher = "{ACM}",
}