@inproceedings{grps2008-99,

   author = "Eliseo Marzal, Laura Sebastia, Eva Onaindia",

   title = "Detection of unsolvable temporal planning problems through the use of landmarks",

   booktitle = "18th European Conference on Artificial Intelligence (ECAI'08)",

   publisher = "IOS Press",

   pages = "919-920",

   isbn = "978-1-58603-891-5",

   year = "2008"

}