@phdthesis{Thiele2009,
  author      = {Henry Thiele},
  title       = {Die Interdependenz formaler und informaler Strukturen im Lichte der Systemtheorie Niklas Luhmanns},
  type        = {doctoralthesis},
  school      = {Universit{\"a}t Potsdam},
  year        = {2009},
}