Dang, Cuong, J. Rodr´ıguez, Leonardo, H. Tran, Nghi, Bao, Forrest, AND Sastry, Shivakumar. " Secrecy Rate and Optimal Power Allocation of the Amplify-and-Forward Relay Wire-Tap System" Journal of Science and Technology: Issue on Information and Communications Technology [Online], Volume 2 Number 1 (31 August 2016)