Jiyuan An Yi-Ping Phoebe Chen Qinying Xu Surface Spatial Index Structure of High-Dimensional Space. 272-278 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3177&spage=272 2004 conf/ideal/2004 IDEAL db/conf/ideal/ideal2004.html#AnCX04