@article{AbrEriKoi08TSP,
  title = "Steepest Descent Algorithms for Optimization Under Unitary Matrix Constraint",
  author = "T. Abrudan and J. Eriksson and V. Koivunen",
  year = "2008",
  copyright = "IEEE",
  journal = "IEEE Transaction on Signal Processing",
  month = "Mar.",
  note = "(to DOWNLOAD the Matlab codes for optimization under unitary matrix constraint, click "Details")",
  number = "3",
  pages = "1134--1147",
  volume = "56",
}