@article{DBLP:journals/vldb/ChenL09,
  author    = {Keke Chen and
               Ling Liu},
  title     = {HE-Tree: a framework for detecting changes in clustering
               structure for categorical data streams},
  journal   = {VLDB J.},
  volume    = {18},
  number    = {6},
  year      = {2009},
  pages     = {1241-1260},
  ee        = {http://dx.doi.org/10.1007/s00778-009-0134-5},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}