Author: Koppitz, J.

Thron, R.; Koppitz, J.: Lattice-theoretically characterized classes of finite bands. (English). Archivum Mathematicum, vol. 39 (2003), issue 1, pp. 1-10
Denecke, K.; Koppitz, J.: Pre-solid varieties of semigroups. (English). Archivum Mathematicum, vol. 31 (1995), issue 3, pp. 171-181

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