Ruo Ando Yoshiyasu Takefuji Two-Stage Orthogonal Network Incident Detection for the Adaptive Coordination with SMTP Proxy. 424-427 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2776&spage=424 2003 conf/mmmacns/2003 MMM-ACNS db/conf/mmmacns/mmmacns2003.html#AndoT03