Stephen A. Cook
Feasibly Constructive Proofs and the Propositional Calculus
STOC, 1975.
@inproceedings{STOC-1975-Cook, author = "Stephen A. Cook", booktitle = "{Proceedings of the Seventh Annual ACM Symposium on Theory of Computing}", doi = "10.1145/800116.803756", pages = "83--97", publisher = "{ACM}", title = "{Feasibly Constructive Proofs and the Propositional Calculus}", year = 1975, }