BibTeX-Format:
@incollection{Klein 2009, publisher = {Mouton de Gruyter}, booktitle = {{D}escribing and {M}odeling {V}ariation in {G}rammar}, title = {{S}emi-modal variation}, author = {Klein, Katarina}, address = {Berlin}, year = {2009}, editor = {Andreas Dufter and Jürg Fleischer and Guido Seiler}, series = {Trends in Linguistics. Studies and Monographs