1. Angelelli, I.: On identity and interchangeability in Leibniz and Frege. Notre Dame J. Form. Logic 8(1–2), 94–100 (1967)
2. Aristotle: Metaphysics. Transl. by W. D. Ross. In: Barnes, J. (ed) The Complete Works of Aristotle, Vol. II. Princeton University Press (1991)
3. Aristotle: Topics. Transl. by W. A. Pickard-Cambridge. In: Barnes, J. (ed) The Complete Works of Aristotle, vol I. Princeton University Press (1991)
4. Béziau, J.Y.: Quine on identity. Principia 7(1–2), 1–15 (2003)
5. Carnap, R.: The logicist foundations of mathematics. In: Benacerraf, P., Putnam, H. (eds.) Philosophy of Mathematics, Selected Readings. Cambridge University Press, Cambridge (1983)