@inproceedings{ijcai1977p96,
  title     = {Predicate Logic: A Calculus for the Formal Derivation of Programs},
  author    = {Clark, Keith L. and Sickel, Sharon},
  booktitle = {Proceedings of the Fifth International Joint Conference on
               Artificial Intelligence, {IJCAI-77}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Raj Reddy},
  pages     = {419--419},
  year      = {1977},
  note      = {Aids to Programming},
  url       = {https://ijcai.org/proceedings/1977/96},
}