Takeshi Shinohara Hiroki Ishizaka On Dimension Reduction Mappings for Approximate Retrieval of Multi-dimensional Data. 224-231 2002 conf/dsp/2002 Progress in Discovery Science http://link.springer.de/link/service/series/0558/bibs/2281/22810224.htm db/conf/dsp/dsp2002.html#ShinoharaI02