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[2] Carnap Rudolf: Meaning and Necessity. The Univ. of Chicago Press, 1947. MR 0019563

[3] Frege G.: Über Sinn und Bedeutung. Zeitschrift für Philosophie und philosophische Kritik, Bd. 100 (1892), 25-50.

[4] Church Alonzo: A Formulation of the Logic of Sence and Denotation. In: P. Henle, H. M. Kallen, S. K. Langer (eds.): Structure, Method and Meaning. The Liberal Arts Press, New York 1951.

[5] Kleene S. C.: Introduction to Metamathematics. Van Nostrand Comp., 1952. MR 0051790 | Zbl 0047.00703

[6] Kotarbiński Tadeusz: Elementy teorii poznania, logiki formalnej i metodologii nauk. Wroclaw-Warszawa-Kraków 1961.

[7] Martin M. R.: Truth and Denotation. A Study in Semantical Theory. Univ. of Chicago Press and Kegan Paul, London 1958.

[8] Mostowski A.: Logika matematiczna. Warszawa-Wroclaw 1948.

[9] Quine Willard van Orman: From a Logical Point of View. Harvard Univ. Press 1953. MR 1445774

[10] Russell Bertrand: Inquiry into Meaning and Truth. George Allen and Unwin Ltd., London 1951.

[11] Russell Betrand: Human Knowledge, its Scope and Limits. George Allen and Unwin Ltd., London.

[12] Tarski Alfred: Introduction to Logic and Methodology of Deductive Sciences. Oxford Univ. Press, 9th Print., New York 1961. MR 1269114

[13] Tarski Alfred: Der Wahrheitsbegriff in den formalisierten Sprachen. Studia philosophica, vol. 1 (1936).

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[16] Tondl Ladislav: Problémy sémantiky. Praha 1966 (in press).

[17] Whitehead A. N., Russell B.: Principia Mathematica. to 56. Cambridge Univ. Press, 1962. MR 0130163

[18] Zich Otakar: Úvod do filosofie matematiky. Jednota českých matematiků a fysiků, Praha 1947.