@InProceedings{porteous:et:al:ecp-01,
  author = 	 {Julie Porteous and Laura Sebastia and J{\"o}rg Hoffmann},
  title = 	 {On the Extraction, Ordering, and Usage of Landmarks in
Planning},
  crossref =     {ecp01},
  pages =         {37-48}
}




@Proceedings{ecp01,
  title = 	 {Recent Advances in AI Planning. 6th European 
                  Conference on Planning (ECP'01)}, 
  booktitle = 	 {Recent Advances in AI Planning. 6th European 
                  Conference on Planning (ECP'01)},
  year = 	 {2001},
  OPTvolume =	 {},
  OPTseries =	 lnai,
  publisher =	 spring,
  address =	 {Toledo, Spain},
  month =	 sep,
  OPTnote = 	 {},
  OPTannote = 	 {},
  OPTISBN      =    {}
}