@INPROCEEDINGS{5054790, author={Liu, Jia and Hou, Y. Thomas and Sherali, Hanif D.}, booktitle={2009 43rd Annual Conference on Information Sciences and Systems}, title={Optimal power allocation for achieving perfect secrecy capacity in MIMO wire-tap channels}, year={2009}, volume={}, number={}, pages={606-611}, doi={10.1109/CISS.2009.5054790}}