1. Almog, Joseph: 1986, ‘Naming Without Necessity’, The Journal of Philosophy, 83, 210–242.
2. Armstrong, D.M.: 1989, A Combinatorial Theory of Possibility. Cambridge University Press, Cambridge.
3. Bealer, George: 1987, ‘The Limits of Scientific Essentialism’, Philosophical Perspectives I: Metaphysics, J. Tomberlin, ed. Ridgeview Publishing Co., Atascadero, California, pp. 289–365.
4. Beth, E.W.: 1960, ‘Extension and Intension’, Synthese, 12, 375–379.
5. Bürge, Tyler: 1992,’Philosophy of Language and Mind: 1950–1990’, The Philosophical Review, 101, 3–51.