1[美]格罗思R.Data mining building competitive advantage[M].侯迪,译.西安:西安交通大学出版社,2001.
2Ester M,Kriegel H P,Sander J. A density-based algorithm for discovering clusters in large spatial databases with noise[J]. Proc 2nd Int Conf on knowledge discovery and Data Mining. Portland, 1999 ,20 : 226.