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2. 2) Octave, <http://www.gnu.org/software/octave/>.
3. 4) Jung, J., Paxson, V., Berger, A.W. and Balakrishnan, H.: Fast Portscan Detection Using Sequential Hypothesis Testing, Proc. 2004 IEEE Symposium on Security and Privacy (S&P'04) (2004).
4. 5) JPCERT/CC: ISDAS, <http://www.jpcert.or.jp/isdas>.