@inproceedings{ijcai2009p300,
  title     = {Learning HTN Method Preconditions and Action Models from Partial Observations},
  author    = {Zhuo, Hankz Hankui and Hu, Derek Hao and Hogg, Chad and Yang, Qiang and Muñoz-Avila, Héctor},
  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     = {1804--1809},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/300},
}