1. Brachman, R.J.: 1983, ‘What IS-A is and isn’t: An Analysis of Taxonomic Links in Semantic Networks’, IEEE Computer 16, pp. 30–36.
2. Fraenkel, A., Bar-Hillel, Y., Levy, L: 1973, Foundations of Set Theory, second revised edition, North-Holland Publishing Company, Amsterdam.
3. Gochet, P.: 1982, ‘The Syncategorematic treatment of Predicates’, in Matilal, B.K. (ed.), Analytical Philosophy in Comparative Perspective, D. Reidel Publishing Company, Dordrecht.
4. Gochet, P.: 1985, The Ascent to Truth, Philosophia Verlag, Munich.
5. Hallet, M.: 1982, Cantorian theory of set and the limitation of size, Clarendon Press, Oxford.