@techreport{Approximation,
  title = "Approximation of Linear Functionals Using an hp-Adaptive Discontinuous Galerkin Finite Element Method",
  author = "K. Harriman and D.J. Gavaghan and E. S\"uli",
  year = "2004",
  institution = "Oxford University Computing Laboratory",
  number = "NA04/19",
  url = "http://web2.comlab.ox.ac.uk/oucl/publications/natr/na-04-19.html",
}