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Wei-Cheng Liao, Tsung-Hui Chang, Wing-Kin Ma, Chong-Yung Chi. QoS-Based Transmit Beamforming in the Presence of Eavesdroppers: An Optimized Artificial-Noise-Aided Approach. IEEE Transactions on Signal Processing, 59(3):1202-1216, 2011. [doi]