user- Annual Meeting of the North American Fuzzy Information Processing Society (2008)
- Concept Lattices: Proceedings of the Second International Conference on Formal Concept Analysis, ICFCA 2004, page 96-103. Berlin, Springer-Verlag, (2004)
- Procedings of the 2nd Pacific Asian Conference on Knowledge Discovery and Data Mining, 1394, page 378-379. Springer Verlag, (1998)
- Education and Information Technologies 3(3):187--201 (01 12 1998/12/01/)
