Zi Huang Heng Tao Shen Jie Shao Stefan M. Rüger Xiaofang Zhou Locality condensation: a new dimensionality reduction method for image retrieval. 219-228 2008 ACM Multimedia http://doi.acm.org/10.1145/1459359.1459389 conf/mm/2008 db/conf/mm/mm2008.html#HuangSSRZ08