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Proceedings of the National Academy of Sciences of the United States of America logoLink to Proceedings of the National Academy of Sciences of the United States of America
. 1963 Jun;49(6):828–832. doi: 10.1073/pnas.49.6.828

A UNIFYING PRINCIPAL IN QUANTIFICATION THEORY

Raymond M Smullyan 1,*
PMCID: PMC300016  PMID: 16591106

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