Warning - the bibtex entry below may be invalid: 
Missing 'booktitle' 
@conference{SymmNectar,
  author = "Karen Petrie with David Cohen, Peter Jeavons, Chris Jefferson and Barbara Smith",
  journal = "In Proc. AAAI 2006",
  pages = "1589-1592",
  publisher = "AAAI Press",
  title = "Constraint Symmetry and Solution Symmetry",
  url = "http://www.aaai.org/Library/AAAI/2006/aaai06-257.php",
  year = "2006",
}