1. Automatic subspace clustering of high dimensional data for data mining applications;Agrawal,1998
2. OPTICS: Ordering points to identify the clustering structure;Ankerst,1999
3. Organization and maintenance of large ordered indices;Bayer,1970
4. The R*-tree: An efficient and robust access method for points and rectangles;Beckmann,1990
5. Pattern recognition with fuzzy objective function algorithms;Bezdek,1981