@inproceedings{Sauerland2009,
  author    = {Uli Sauerland},
  title     = {Guess how?},
  booktitle = {J. Costa / J. Goedemans / R. van Vijver : Proceedings of CONSOLE 4},
  pages     = {297 -- 311},
  url       = {http://www.zas.gwz-berlin.de/mitarb/homepage/sauerland/proceedings/console96.pdf},
  year      = {2009},
}