BibTeX-Format:
@incollection{Klein 2009, author = {Klein, Katarina}, booktitle = {{D}escribing and {M}odeling {V}ariation in {G}rammar}, title = {{S}emi-modal variation}, editor = {Andreas Dufter and Jürg Fleischer and Guido Seiler}, pages = {297-323}, year = {2009}, series = {Trends in Linguistics. Studies and Monographs