@TechReport{	  it:2015-009,
  author	= {Emilie Blanc},
  title		= {Approximation of the Diffusive Representation by
		  Decreasing Exponential Functions},
  institution	= {Department of Information Technology, Uppsala University},
  department	= {Division of Scientific Computing},
  year		= {2015},
  number	= {2015-009},
  month		= feb,
  abstract	= {Diffusive representation of pseudo-differential operators
		  is a theory that has attracted interest during the last
		  years, and the discretization of the diffusive
		  representation allows significant simplifications for
		  numerical integration encountered in many physical models.
		  The feasibility of such integration relies on efficient
		  determination of the coefficients involved in the
		  representation. In this report a novel way to determine
		  such coefficients is proposed based on non-linear
		  optimization. Compared to the typical method using Gaussian
		  quadrature, our new approach is shown to lead to more
		  accurate approximation in a particular case with
		  application to computational biology.}
}