@unpublished{TelljohannHinrichsKuebler2004,
  author  = {Heike Telljohann and Erhard Hinrichs and Sandra K{\"u}bler},
  title   = {The T{\"u}ba-D/Z treebank : annotating German with a context-free backbone},
  institution = {Extern},
  pages     = {4},
  year    = {2004},
}