1. Bar-Hillel, Y., & Carnap, R. (1952). An outline of a theory of semantic information, rep. in Bar-Hillel (1964) pp. 221–274.
2. Barwise, J., & Perry, J. (1983). Situations and attitudes, reprinted by CSLI, 1999.
3. Braman, S. (1989). Defining information. Telecommunications Policy, 13, 233–242.
4. Carnap, R. (1956). Meaning and necessity: A study in semantics and modal logic. Chicago: The University of Chicago Press.
5. Carnap, R. (1955). Meaning and synonymy in natural languages. Philosophical Studies, 6, 33–47.