BibTeX-Format:
@incollection{Klein 2009, title = {{S}emi-modal variation}, address = {Berlin}, publisher = {Mouton de Gruyter}, booktitle = {{D}escribing and {M}odeling {V}ariation in {G}rammar}, pages = {297-323}, year = {2009}, typ = {incollection}, series = {Trends in Linguistics. Studies and Monographs