@Article{hla-profilter,
  author	= {F. Hlawatsch and W. Kozek},
  title		= {Time-frequency projection filters and time-frequency signal expansions},
  journal	= {IEEE Trans. Signal Processing},
  year		= {1994},
  month		= {Dec.},
  volume	= {42},
  number	= {12},
  pages		= {3321--3334}
}