@Misc{		  Bachmayr,
  author	= {Bachmayr, Markus},
  title		= {Kolmogorov widths and low-rank approximations of
		  parametric elliptic {PDE}s},
  annote	= {report},
  howpublished	= {In Oberwolfach Report 2/2015, Mathematisches
		  Forschungsinstitut Oberwolfach}
}