@PhDThesis{	  diss_kop,
  author	= "Steffen Kopecki",
  title		= "Formal language theory of hairpin formations",
  type		= "Dissertation",
  school	= "University of Stuttgart",
  year		= "2011",
  language	= "eng",
  url		= "https://elib.uni-stuttgart.de/handle/11682/2723"
}