@inproceedings{ijcai1995p197,
  title     = {Cancelling and Overshadowing: Two Types of Defeasibility in Defeasible Deontic Logic},
  author    = {van der Torre, Leendert W. N. and Tan, Yao-Hua},
  booktitle = {Proceedings of the Fourteenth International Joint Conference on
               Artificial Intelligence, {IJCAI-95}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Chris S. Mellish},
  pages     = {1525--1532},
  year      = {1995},
  note      = {Non-monotonic Reasoning},
  url       = {https://ijcai.org/proceedings/1995/197},
}