@article{Seyfried2012,
  author    = {Markus Seyfried},
  title     = {Problems and methods of quality evaluation in different policy fields},
  journal   = {Zeitschrift f{\"u}r Evaluation},
  volume    = {11},
  number    = {2},
  pages     = {209 -- 232},
  year      = {2012},
}