Daniel S. Yeung Shuyuan Jin Xizhao Wang Covariance-Matrix Modeling and Detecting Various Flooding Attacks. 157-169 2007 37 IEEE Transactions on Systems, Man, and Cybernetics, Part A 2 http://doi.ieeecomputersociety.org/10.1109/TSMCA.2006.889480 db/journals/tsmc/tsmca37.html#YeungJW07