@incollection{Lang2013,
  author    = {Ewald Lang},
  title     = {Einf{\"u}hrung},
  booktitle = {Copular and aux-constructions, Zentrum f{\"u}r Allgemeine Sprachwissenschaft, Sprachtypologie und Universalienforschung, Berlin, 2000; ZAS papers in linguistics Vol. 16},
  volume    = {16},
  url       = {http://www.zas.gwz-berlin.de/210.html},
  year      = {2013},
}