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20-06 Proceedings, conferences, collections, etc. (2 articles)

• Introduction [Loops and quasigroups]. (Czech). Commentationes Mathematicae Universitatis Carolinae, vol. 49 (2008), issue 2, pp. 169-170
• Introduction. (English). Commentationes Mathematicae Universitatis Carolinae, vol. 45 (2004), issue 2, pp. 189-190