http://club.techtarget.com.cn/space/viewspacepost.aspx?postid=1150
http://searchsecurity.techtarget.com/definition/security-information-and-event-management-SIEM
http://whatis.techtarget.com/definition/correlation-engine
http://club.techtarget.com.cn/space/viewspacepost.aspx?postid=1150