k-means http://www.cnblogs.com/jerrylead/archive/2011/04/06/2006910.html
DBSCAN http://blog.csdn.net/itplus/article/details/10088625
http://www.cnblogs.com/chaosimple/archive/2013/07/01/3164775.html
谱聚类
聚类算法比较 http://blog.chinaunix.net/uid-10289334-id-3758310.html