@inproceedings{PredicateSymbols,
  title = "Data independence with predicate symbols",
  author = "A. W. Roscoe and R.S. Lazic",
  year = "1999",
  booktitle = "{Proceedings of the International Conference on Parallel and Distributed Processing Techniques and Applications (PDPTA'99)}",
  publisher = "{CSREA Press}",
  url = "http://www.cs.ox.ac.uk/people/bill.roscoe/publications/71.ps",
  volume = "I",
}