@techreport{KriegerSchaefer93,
  author	= {Krieger, Hans-Ulrich and Sch{\"a}fer, Ulrich},
  year		= {1993},
  title		= {TDL - A type description language for unification-based grammars},
  address	= {Saarbr{\"u}cken},
  institution	= {DFKI}
}