R. Jäschke, A. Hotho, C. Schmitz, B. Ganter, and G. Stumme. ICDM '06: Proceedings of the Sixth International Conference on Data Mining, page 907--911. Washington, DC, USA, IEEE Computer Society, (2006)
F. Lehmann, and R. Wille. Conceptual Structures: Applications, Implementation
and Theory, volume 954 of Lecture Notes in Computer Science, Springer, Berlin/Heidelberg, (1995)
R. Jäschke, A. Hotho, C. Schmitz, B. Ganter, and G. Stumme. Proceedings of the 6th IEEE International Conference on Data Mining (ICDM 06), page 907-911. Hong Kong, IEEE Computer Society, (December 2006)
S. Krolak-Schwerdt, P. Orlik, and B. Ganter. Studies in Classification, Data Analysis, and Knowledge Organization, volume 4 of Information systems and data analysis, Springer, Berlin, (1994)
F. Lehmann, and R. Wille. Conceptual structures: applications, implementation and theory, 954, page 32-43. Berlin--Heidelberg--New~York, Springer--Verlag, (1995)