@inproceedings{grps2001-61,

   author = "J. Porteous, L. Sebastia",

   title = "Extracting and Ordering Landmarks for Planning",

   booktitle = "International Conference on Artificial Intelligence - Special Session on Learning and Adapting in AI Planning",

   publisher = "CSREA Press",

   volume = "2",

   pages = "1005-1011",

   isbn = "1-892512-79-3",

   year = "2001"

}