@Article{Hlawatsch91a,
  author	= {F. Hlawatsch},
  title		= {Duality and classification of bilinear time-frequency signal representations},
  journal	= {IEEE Trans. Signal Processing},
  year		= {1991},
  month		= {July},
  volume	= {39},
  number	= {7},
  pages		= {1564--1574}
}