@Conference{wokurek87,
  author	= {W. Wokurek and F. Hlawatsch and G. Kubin},
  title		= {{W}igner Distribution Analysis of Speech Signals},
  booktitle	= {Proc. 1987 Int. Conf. on Digital Signal Processing},
  year		= {1987},
  month		= {Sept.},
  address	= {Florence, Italy},
  pages		= {294--298}
}