@incollection{Jaeger2013,
  author    = {Gerhard J{\"a}ger},
  title     = {Towards an explanation of copula effects},
  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},
}