@article{AbrEriKoi09SP,
  title = "Conjugate Gradient Algorithm for Optimization under Unitary Matrix Constraint",
  author = "T. Abrudan and J. Eriksson and V. Koivunen",
  year = "2009",
  copyright = "Elsevier B.V.",
  journal = "Signal Processing (Elsevier)",
  month = "Sep.",
  note = "(to DOWNLOAD the Matlab codes for optimization under unitary matrix constraint, click "Details")",
  number = "9",
  pages = "1704--1714",
  volume = "89",
}