@article{wang:TSP10,
  title = "{On the robustness of transmit beamforming}",
  author = "J.~Wang and M.~Payar\'o",
  journal = "{IEEE} Trans. on Signal Processing",
  volume = "58",
  number = "11",
  month = "Nov.",
  pages = "5933 - 5938",
  year = {2010}
}