@conference {25727,
	title = {Optimality of beamforming in multiple-transmit multiple-receive communications systems with partial channel knowledge},
	booktitle = {Proc. DIMACS Series Discrete Mathematics and Theoretical Computer Science},
	volume = {62},
	year = {2003},
	pages = {57-67},
	author = {Steven H. Simon and Aris L. Moustakas}
}
