Warning - the bibtex entry below may be invalid: 
Missing 'booktitle' 
@conference{GracefulGraphsConf,
  author = "Karen Petrie with Barbara Smith",
  journal = "In Proc. CP 2003",
  pages = "930-935",
  publisher = "Springer",
  series = "LNCS 2833",
  title = "Symmetry Breaking in Graceful Graphs",
  url = "http://www.springerlink.com/content/59grn8unlnughv0h/?p=ee326e2b5e8740ccb8625c77909781cb&pi=80",
  year = "2003",
}