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04.20 Relations (2 articles)

• Schwarz, Štefan: On idempotent binary relations on a finite set. (English). Czechoslovak Mathematical Journal, vol. 20 (1970), issue 4, pp. 696-702
• Hedrlín, Zdeněk: On a number of commuting transformations. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 4 (1963), issue 3, pp. 132-136