@Article{hla-wigspace,
  author	= {F. Hlawatsch and W. Kozek},
  title		= {The {W}igner distribution of a linear signal space},
  journal	= {IEEE Trans. Signal Processing},
  year		= {1993},
  month		= {March},
  volume	= {41},
  number	= {3},
  pages		= {1248--1258}
}