两本老书。
Algorithms for Clustering Data
by:Anil K. Jain, Richard C. Dubes
目录：
1 introduction
2 data representation
3 clustering methods
4 cluster validity
5 applications
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C4.5:Programs for Machine Learning
by:John Ross Quinlan
目录：
1 introduction
2 constructing decision trees
3 unknown attribute values
4 pruning decision trees
5 from trees to rules
6 windowing
7 grouping attribute values
8 interacting with classification models
9 guide to using the system
10 limitations
11 desirable additions
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