[2] R. Carnap Y. Bar-Hillel:
Semantic Information. British Journal for the Philosophy of Science 4 (1953).
MR 0058545
[3] R. Carnap Y. Bar-Hillel:
An Outline of the Theory of Semantic Information. Research Laboratory of Electronics, Massachusetts Institute of Technology, Report No. 247, 1952.
MR 0058545
[4] C. C. Chang H. J. Keisler: Model Theory. North-Holland Publishing Company, Amsterdam-London 1974.
[5] J. L. Bell A. B. Slomson: Models and Ultraproducts. North-Holland Publishing Company, Amsterdam -London 1974.
[6] L. Rieger:
Algebraic Methods of Mathematical Logic. Academic Press, New York-London 1967.
Zbl 0218.02001
[7] A. Rényi:
Probability Theory. North-Holland Publishing Company, Amsterdam-London 1970.
MR 0315747
[8] M. Loève:
Probability Theory. D. van Nostrand Company Inc., Princeton-New York-London 1961.
MR 0203748