Nguyen, Tien Hoa and Nguyen, Thanh Hieu and Nguyen, Van Duc and Truong, Vu Bang Giang  (2013) Power Optimization for Multiuser MISO-OFDMA Based Cognitive Radio Systems.  In: 2013: 6th International Conference on Advanced Technologies for Communications (ATC), 16-18 October 2013, Ho Chi Minh city, Vietnam.