@Article{HH02b,
  author = 	 {Ralf Hartmann and Paul Houston},
  title = 	 {Adaptive Discontinuous {G}alerkin Finite Element Methods
                  for the Compressible {E}uler Equations},
  journal = 	 {J. Comp. Phys.},
  year = 	 2002,
  volume =	 183,
  number =	 2,
  pages =	 {508--531}
}