Fujio Tsutsumi Sound Visualization and Retrieval Technique for Assisting Hearing Memory of Patrol Worker. 363-367 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2795&spage=363 2003 conf/mhci/2003 Mobile HCI db/conf/mhci/mhci2003.html#Tsutsumi03