@INPROCEEDINGS{4533725, author={Liu, J. and Hou, Y. T. and Sherali, H. D.}, booktitle={2008 IEEE International Conference on Communications}, title={On the Maximum Weighted Sum-Rate of MIMO Gaussian Broadcast Channels}, year={2008}, volume={}, number={}, pages={3664-3668}, doi={10.1109/ICC.2008.689}}