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• Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica
• Volume 33

Author: Chajda, Ivan

• Chajda, Ivan; Halaš, Radomír: Genomorphisms of lattices and semilattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 33 (1994), issue 1, pp. 23-27
• Chajda, Ivan: Principal tolerances on lattices. (English). Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica, vol. 33 (1994), issue 1, pp. 17-22