1. J.L. Bell, Orthologic, Forcing and the Manifestation of Attributes', in Southeast Asian Conference on Logic. Studies in Logic III, North-Holland, Amsterdam, 1983.
2. J. Czelakowski, Logics based on partial Boolean ?-algebras (1), Studia Logica XXXIII, 4, pp. 371?395, 1974.
3. J. Czelakowski, Logics based on partial Boolean ?-algebras (2), Studia Logica XXXIV, 1, pp. 69?86, 1976.
4. M. L. Dalla Chiara, Quantum Logic, in D. M. Gabbay, F. Guenthner (eds.), Handbook of Philosophical Logic, Vol. III, Reidel, Dordrecht, 1985.
5. R. Giuntini, Difficoltà Logiche in Alcune Teorie delle Variabili Nascoste, Dissertation, Università di Firenze, 1984.