Takeshi Shinohara Jianping Chen Hiroki Ishizaka H-Map: A Dimension Reduction Mapping for Approximate Retrieval of Multi-dimensional Data. 299-305 http://link.springer.de/link/service/series/0558/bibs/1532/15320299.htm 1999 conf/dis/1999 Discovery Science http://link.springer.de/link/service/series/0558/bibs/1721/17210299.htm db/conf/dis/dis99.html#ShinoharaCI98