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2. Dummett, M.: Elements of Intuitionism. Oxford University Press, Oxford (1977)
3. Dummett, M.: The Logical Basis of Metaphysics. Harvard University Press, Cambridge (1991)
4. Dummett, M.: Frege: Philosophy of Language, 2nd edn. Harvard University Press, Cambridge (1993)
5. Frege, G.: Collected Papers on Mathematics, Logic and Philosophy. Basil Blackwell, New York. Translated by M. Black, V. Dudman, P. Geach, H. Kaal, E.-H.W. Kluge, B. McGuinness & R.H. Stoothoff(1984)