@inproceedings{ijcai2019p197,
  title     = {Why Can’t You Do That HAL? Explaining Unsolvability of Planning Tasks},
  author    = {Sreedharan, Sarath and Srivastava, Siddharth and Smith, David and Kambhampati, Subbarao},
  booktitle = {Proceedings of the Twenty-Eighth International Joint Conference on
               Artificial Intelligence, {IJCAI-19}},
  publisher = {International Joint Conferences on Artificial Intelligence Organization},
  pages     = {1422--1430},
  year      = {2019},
  month     = {7},
  doi       = {10.24963/ijcai.2019/197},
  url       = {https://doi.org/10.24963/ijcai.2019/197},
}