PATZIG, G. Aristotle, Lukasiewicz and the Origins of Many-Valued Logic. In: SUPPES, Patrick (Ed.). Logic, Methodology and Philosophy of Science IV, Amsterdam: North-Holland Publishing Company, 1973. p.921-929.
KLINE, George L. N.A. Vasil’év and the development of Many-valued logic. Contribuitions to Logic and Methodology, in honor to J.M. Bochenski, Amsterdam, p.315-326, 1965