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08B30 Injectives, projectives (2 articles)

• Ježek, J.: One-element extensions in the variety generated by tournaments. (English). Czechoslovak Mathematical Journal, vol. 54 (2004), issue 1, pp. 233-246
• Ježek, J.: Constructions over tournaments. (English). Czechoslovak Mathematical Journal, vol. 53 (2003), issue 2, pp. 413-428