Checking Proofs in the Metamathematics of First Order Logic

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\begin{bibtex} @inproceedings{DBLP:conf/ijcai/AielloW75, title={Checking Proofs in the Metamathematics of First Order Logic}, pages={1-8}, year={1975}, booktitle={IJCAI}, url={http://www.informatik.uni-trier.de/~ley/db/conf/ijcai/ijcai75.html#AielloW75}, author={Mario Aiello and Richard W. Weyhrauch} }\end{bibtex}