@article{JannSeyfried2009,
  author    = {Jann, Werner and Seyfried, Markus},
  title     = {Does executive governance matter? executives an policy performance},
  isbn      = {978-3-86793-013-0},
  year      = {2009},
  language  = {en}
}
@article{JannBach2009,
  author    = {Jann, Werner and Bach, Tobias},
  title     = {Structure and governance of agencies in Germany : a lot of continuity and little change},
  isbn      = {978-82-450-0754-1},
  year      = {2009},
  language  = {en}
}