Warning - the bibtex entry below may be invalid: 
Missing 'booktitle' field 
@inproceedings{SBDDSBDS,
  author = "Karen Petrie",
  journal = "In Proc. SymCon 2004",
  pages = "55-63",
  title = "Combining SBDS and SBDD",
  url = "http://zeynep.web.cs.unibo.it/SymCon04/",
  year = "2004",
}