@TechReport{	  it:2003-006,
  author	= {Henrik Brand{\'e}n and Per Sundqvist},
  title		= {An Algorithm for Computing Fundamental Solutions of
		  Difference Operators},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Scientific Computing},
  year		= {2003},
  number	= {2003-006},
  month		= feb,
  abstract	= {We propose an FFT-based algorithm for computing
		  fundamental solutions of difference operators with constant
		  coefficients. Our main contribution is to handle cases
		  where the symbol has zeros.}
}