@book{Keller2009,
  author    = {Rudi Keller},
  title     = {Bewerten : Vortrag f{\"u}r das Kolloquium "Values and Evaluating" an der University of California at Davis im Oktober 2002},
  number    = {16},
  url       = {http://www.phil-fak.uni-duesseldorf.de/uploads/media/Bewerten.pdf},
  year      = {2009},
}