1. Han J, Pei J, Kamber M (2011) Data mining: concepts and techniques. Morgan Kaufmann, San Francisco
2. Jain AK, Murty MN, Flynn PJ (1999) Data clustering: a review. ACM computing surveys (CSUR) 31(3):264–323
3. Ester M, Kriegel HP, Sander J, Xu XW (1996) A density-based algorithm for discovering clusters a density-based algorithm for discovering clusters in large spatial databases with noise. Proc Second Int Conf Knowl Discovery Data Min 96(34):226–231
4. Ankerst M, Breunig MM, Kriegel H, Sander J (1999) Optics: ordering points to identify the clustering structure. Proc ACM Sigmod Rec 28(2):49–60
5. Xu XW, Ester M, Kriegel HP, Sander J (1998) A distribution-based clustering algorithm for mining in large spatial databases. In: Proceedings of 14th IEEE international conference data engineering (ICDE),Orlando, Florida, USA, pp 324–331