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2. Boole, G. 1854. An investigation of the laws of thought on which are founded the mathematical theories of logic and probabilities. London: Walton and Maberley.
3. Boole, G. 1952. Studies in logic and probability. Edited by R. Rhees. La Salle: Open Court.
4. Carnap, R. 1934. Logische Syntax der Sprache. Wien: Julius Springer.
5. Frege, G. 1979. Posthumous writings. Oxford: Blackwell.