1. Bull, R. A. und K. Segerberg: 1984, ‘Basic Modal Logic’, in D. M. Gabbay und F. Guenthner (eds.), pp. 1–89.
2. CarnapR.: 1947, Meaning and Necessity, The University of Chicago Press, Chicago.
3. Castañeda, H.-N.: 1967, ‘On the Logic of Self-Knowledge’, in Noûs 1, 9–22.
4. GabbayD. M. und F.Guenthner (eds.): 1984, Handbook of Philosophical Logic, Bd. II, D. Reidel, Dordrecht.
5. HintikkaJ. J.: 1962, Knowledge and Belief, Cornell University Press, Ithaca, New York.