user- Beiträge zur Begriffsanalyse, B.I.--Wissenschaftsverlag, Mannheim, (1987)
- Begriffliche Wissensverarbeitung: Methoden und Anwendungen, page 25-56. Heidelberg, Springer, (2000)
- Springer--Verlag, Berlin--Heidelberg, (1997)
- Logic and algebra, page 267-281. New~York, Marcel Dekker, (1996)
- Beiträge zur Begriffsanalyse, B.I.--Wissenschaftsverlag, Mannheim, (1987)
- Classification as a tool of research, page 169-176. Amsterdam, North--Holland, (1986)
- Conceptual structures: representation as interlingua, page 23-39. Berlin--Heidelberg--New York, Springer--Verlag, (1996)
- Conceptual structures: applications, implementation and theory, 954, Berlin--Heidelberg--New~York, Springer--Verlag, (1995)
- Conceptual Structures: Knowledge Representation as Interlingua Proc. ICCS'96, volume 1115 of LNAI, page 308-320. Heidelberg, Springer, (1996)
- Proc. Intl. Symposium on Knowledge Retrieval, Use, and Storage for Efficiency, page 206-219. Vancouver, Canada, (August 1997)
- From data to knowledge, page 141-150. Heidelberg, Springer--Verlag, (1996)
- Conceptual structures: applications, implementation and theory, 954, page 32-43. Berlin--Heidelberg--New~York, Springer--Verlag, (1995)
- Order (1995)
- Conceptual structures: Fulfilling Peirce's dream, 1257, Berlin--Heidelberg--New York, Springer--Verlag, (1997)
- General algebra and applications in discrete mathematics, page 23-33. Aachen, Shaker Verlag, (1997)
- Informationsgewinnung aus Messdaten. 6. Arbeitsgespräch der Fachgruppe Physik/Informatik/Informationstechnik, page 100-111. Berlin, 122. PTB-Seminar, Physikalisch-Technische Bundesanstalt, (1995)
- TH Darmstadt, (1996)
- TH Darmstadt, (1996)
- Psychoanalytic research by means of formal concept analysis, Special des Sigmund--Freud--Instituts, Lit Verlag, Münster, (to appear)
- TH Darmstadt, (1996)
