@Article{	  Ludovici.Neitzel.Wollner:2015,
  author	= {Ludovici, F. and Neitzel, I. and Wollner, W.},
  title		= {A priori error estimates for nonstationary optimal control
		  problems with gradient constraints},
  journal	= {PAMM},
  year		= {2015},
  volume	= {15},
  number	= {1},
  pages		= {611--612},
  doi		= {10.1002/pamm.201510295},
  annote	= {series}
}