@inproceedings{ijcai1983p188,
  title     = {A Result on the Computational Complexity of Heuristic Estimates for the A* Algorithm},
  author    = {Valtorta, Marco},
  booktitle = {Proceedings of the Eighth International Joint Conference on
               Artificial Intelligence, {IJCAI-83}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Alan Bundy},
  pages     = {777--778},
  year      = {1983},
  note      = {Planning and Search},
  url       = {https://ijcai.org/proceedings/1983/188},
}