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Begriffliche Wissensverarbeitung: Theorie und Praxis Enthalten in Informatik-Spektrum Bd. 23, Nr. 6, date:12.2000: 357-369
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Eulers Speculum Musicum und das Instrument MUTABOR Enthalten in Deutsche Mathematiker-Vereinigung: Mitteilungen der Deutschen Mathematiker-Vereinigung Bd. 8, 2000, Nr. 4: 9-12. 4 S.
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Coordinatization of ordinal structures Enthalten in Order Bd. 13, Nr. 3, date:9.1996: 281-294
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The Basic Theorem of triadic concept analysis Enthalten in Order Bd. 12, Nr. 2, date:6.1995: 149-158
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Tensorial decomposition of concept lattices Enthalten in Order Bd. 2, Nr. 1, date:3.1985: 81-95
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The strong selection property and ordered sets of finite length Enthalten in Algebra universalis Bd. 18, Nr. 1, date:2.1984: 18-28
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Subdirect decomposition of concept lattices Enthalten in Algebra universalis Bd. 17, Nr. 1, date:12.1983: 275-287
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Note on compatible operations of modular lattices Enthalten in Algebra universalis Bd. 16, Nr. 1, date:12.1983: 395-397
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Finite sublattices of four-generated modular lattices Enthalten in Algebra universalis Bd. 12, Nr. 1, date:12.1981: 160-171
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Lattices freely generated by partially ordered sets: which can be "drawn"? Enthalten in Journal für die reine und angewandte Mathematik Bd. 1979, 1979, Nr. 310: 56-80
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