3Sander J,Ester M,Kriegel H P,et al.Density based clustering in spatial databases:the algorithm GDBSCAN and its applications[J].Data Mining and Knowledge Discovery,1998,2(2):169-194.
4Ester Martin,Kriegel Hans-Peter,Sander Jorg,et al.A density-based algorithm for discovering clusers in large spatial databases with noise[C]//Proceedings of 2nd International Conference on Knowledge Discovery and Data Mining(KDD-96).1996:226-231.