@Article{	  Bachmayr.Cohen:2016,
  author	= {Bachmayr, Markus and Cohen, Albert},
  title		= {Kolmogorov widths and low-rank approximations of
		  parametric elliptic {PDE}s},
  journal	= {Mathematics of Computation},
  annote	= {journal},
  doi		= {10.1090/mcom/3132},
  volume	= {86},
  pages		= {701--724},
  year		= {2017},
  eprint	= {1502.03117}
}