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