@techreport{SteinerTeich90,
  author	= {Steiner, Erich H. and Teich, Elke},
  year		= {1990},
  title		= {Representational extensions to the PENMAN framework / systemic grammar},
  address	= {Darmstadt, West Germany},
  institution	= {GMD/Institut f{\"u}r Integrierte Publikations- und Informationssysteme}
}