@PhDThesis{	  Walter16diss,
  author	= "Tobias Walter",
  school	= "Institut f{\"u}r {F}ormale {M}ethoden der {I}nformatik,
		  {U}niversit{\"a}t {S}tuttgart\ {}",
  type		= "{D}issertation",
  title		= "Local Divisors in Formal Languages",
  year		= "2016"
}