@Article{	  Bachmayr.Schneider:2016,
  author	= {Bachmayr, Markus and Schneider, Reinhold},
  title		= {Iterative methods based on soft thresholding of
		  hierarchical tensors},
  journal	= {Found. Comput. Math.},
  annote	= {journal},
  fjournal	= {Foundations of Computational Mathematics. The Journal of
		  the Society for the Foundations of Computational
		  Mathematics},
  doi		= {10.1007/s10208-016-9314-z},
  year		= {2017},
  volume	= {17},
  number	= {4},
  pages		= {1037--1083}
}