Masayoshi Mizutani Shin Shirahata Masaki Minami Jun Murai ROOK: Multi-session Based Network Security Event Detector. 48-54 2008 SAINT http://doi.ieeecomputersociety.org/10.1109/SAINT.2008.110 conf/saint/2008 db/conf/saint/saint2008.html#MizutaniSMM08