1. A. L. CAUCHY, Démonstration d'un théorème curieux sur les nombres, Bull. Sc. Soc. Philomatique Paris, (3) 3 (1816) 133–135. Reproduced in Exercices Math., 1 (1826)114–116, and in Oeuvres, (2) 6 (1887) 146–148.
2. R. HÄHNLE, Uniform notation tableau rules for multiple-valued logic, Proc. 21th Int. Symp. on Multiple-Valued Logic, Victoria, B.C., Canada, IEEE Press, 1991, pp. 238–245.
3. G. H. HARDY, E. M. WRIGHT, “An Introduction to the Theory of Numbers”, Fifth Edition, Oxford University Press, London, 1979.
4. R. MCNAUGHTON, A theorem about infinite-valued sentential logic, Journal of Symbolic Logic, 16 (1951) 1–13.
5. D. MUNDICI, Satisfiability in many-valued sentential logic is NP-complete, Theoretical Computer Science, 52 (1987) 145–153.