@Article{	  Burstedde.Ghattas.Stadler.ea:2009,
  author	= {Burstedde, Carsten and Ghattas, Omar and Stadler, Georg
		  and Tu, Tiankai and Wilcox, Lucas C.},
  title		= {Parallel scalable adjoint-based adaptive solution for
		  variable-viscosity {S}tokes flows},
  journal	= {Computer Methods in Applied Mechanics and Engineering},
  year		= {2009},
  volume	= {198},
  pages		= {1691-1700}
}