@techreport{Zajac91-modularity,
  author	= {Zajac, R{\'e}mi},
  year		= {1991},
  title		= {Modularity and stratification in unification grammars},
  address	= {Stuttgart, Germany},
  institution	= {Project POLYGLOSS, Institut f{\"u}r Maschinelle Sprachverarbeitung, University of Stuttgart}
}