@TechReport{	  it:2011-016,
  author	= {Elena Sundkvist and Elisabeth Larsson},
  title		= {Implementation of a Collocated Boundary Element Method for
		  Acoustic Wave Propagation in Multilayered Fluid Media},
  institution	= {Department of Information Technology, Uppsala University},
  year		= {2011},
  number	= {2011-016},
  month		= jun,
  abstract	= {The numerical solution of the Helmholtz equation with
		  nonlocal radiation boundary conditions is considered. We
		  model sound wave propagation in a multilayered piecewise
		  homogeneous medium. A fourth-order accurate collocated,
		  boundary element method is used, where the solution inside
		  the domain is computed through a representation integral.
		  The method is shown to have the expected fourth-order
		  convergence and is also compared with a fourth-order
		  accurate finite difference method. }
}