@inproceedings{FeMa06,
	author = {Anke Feiten and Rudolf Mathar},
	title = "Minimax Problems and Directional Derivatives for {MIMO} Channels",
	booktitle = "{IEEE} VTC Spring 2006",
	address = {Melbourne},
	year = 2006,
	hsb = {RWTH-CONV-223554},
	}