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G. Stumme. Ordinal and Symbolic Data Analysis. Proc. OSDA'95. Studies in Classification, Data Analysis, and Knowledge Organization 8, page 31-44. Heidelberg, Springer, (1996)
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A. Hotho, S. Staab, and G. Stumme. Knowledge Discovery in Databases: PKDD 2003, 7th European Conference on Principles and Practice of Knowledge Discovery in Databases, volume 2838 of LNAI, page 217-228. Heidelberg, Springer, (2003)
G. Stumme. Ordinal and Symbolic Data Analysis. Proc. OSDA'95. Studies in Classification, Data Analysis, and Knowledge Organization 8, page 31-44. Heidelberg, Springer, (1996)