Hyun Joo Kim Jung-Chan Na Sung Won Sohn Shortest-Path Mailing Service Using Active Technology. 336-345 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2662&spage=336 2003 conf/icoin/2003 ICOIN db/conf/icoin/icoin2003.html#KimNS03