@unpublished{HinrichsKueblerNaumann2004,
  author  = {Erhard Hinrichs and Sandra K{\"u}bler and Karin Naumann},
  title   = {A unified representation for morphological, syntactic, semantic, and referential annotations},
  institution = {Extern},
  pages     = {8},
  year    = {2004},
}