1. Dummett M. (1972) Frege: Philosophy of language. Duckworth, London
2. Frege, G. (1879). Conceptual notation, a formula language of pure thought modelled upon the formula language of arithmetic. In Conceptual notation and related articles (T. W. Bynum, Trans. and Ed.). Oxford: Clarendon Press; 1972.
3. Frege, G. (1880/1881). Boole’s logical calculus and the concept-script. In H. Hermes, F. Kambartel, & F. Kaulbach (Eds.), Posthumous writings (P. Long & R. White, Trans.). Chicago: University of Chicago Press; 1979.
4. Frege, G. (1882a). On the scientific justification of a conceptual notation. In Conceptual notation and related articles (T. W. Bynum, Trans. and Ed.). Oxford: Clarendon Press; 1972.
5. Frege, G. (1882b). On the aim of the ‘conceptual notation’. In Conceptual notation and related articles. (T. W. Bynum, Trans. and Ed.). Oxford: Clarendon Press; 1972.