@inproceedings{ijcai2009p288,
  title     = {Cost-Optimal Planning with Landmarks},
  author    = {Karpas, Erez and Domshlak, Carmel},
  booktitle = {Proceedings of the Twenty-First International Joint Conference on
               Artificial Intelligence, {IJCAI-09}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Hiroaki Kitano},
  pages     = {1728--1732},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/288},
}