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Proceedings of the Olomouc Workshop on General Algebra, "56. Arbeitstagung Allgemeine Algebra", June 12 - 14, 1998 and of the Summer School '98 on Universal Algebra and Ordered Sets, Velké Karlovice, August 31 - September 5, 1998
Ivan Chajda
Proceedings of the 60th Workshop on General Algebra, "60. Arbeitstagung Allgemeine Algebra", University of Technology Dresden, June 22 - 25, 2000 and of the Summer School '99 on General Algebra and Ordered Sets, Velké Karlovice, August 30 - September 4, 1999
Ivan Chajda