Jungsuk Song Hayato Ohba Hiroki Takakura Yasuo Okabe Kenji Ohira Yongjin Kwon A Comprehensive Approach to Detect Unknown Attacks Via Intrusion Detection Alerts. 247-253 2007 conf/asian/2007 ASIAN http://dx.doi.org/10.1007/978-3-540-76929-3_23 db/conf/asian/asian2007.html#SongOTOOK07