@Article{	  Carstensen.Peterseim.Schroder:2012,
  author	= {C. Carstensen and D. Peterseim and A. Schr\"oder},
  title		= {The Norm of a Discretized Gradient in ${H}(div)^*$ for A
		  Posteriori Finite Element Error Analysis},
  journal	= {Numer. Math.},
  fjournal	= {Numerische Mathematik},
  year		= {2015},
  volume	= {132},
  number	= {3},
  pages		= {519--539},
  doi		= {10.1007/s00211-015-0728-3},
  url		= {http://dx.doi.org/10.1007/s00211-015-0728-3},
  annote	= {journal}
}