@Article{	  Bachmayr.Cohen.Migliorati:2016,
  author	= {Bachmayr, Markus and Cohen, Albert and Migliorati,
		  Giovanni},
  title		= {Sparse polynomial approximation of parametric elliptic
		  {PDE}s. {P}art {I}: affine coefficients},
  journal	= {ESAIM Math. Model. Numer. Anal.},
  annote	= {journal},
  fjournal	= {ESAIM. Mathematical Modelling and Numerical Analysis},
  doi		= {10.1051/m2an/2016045},
  volume	= {51},
  number	= {1},
  pages		= {321--339},
  year		= {2017},
  eprint	= {1509.07045}
}