@Article{gvw-2000,
  title = 	 {Approximating binary images from discrete X-rays},
  author = 	 {Peter Gritzmann and Sven de Vries and Markus Wiegelmann},
  journal = 	 {SIAM J. Optim.},
  url= {http://dx.doi.org/10.1137/S105262349935726X},
  year = 	 2000,
  volume = 	 11,
  number = 	 2,
  pages = 	 {522--546}}