add support for chunk reference (fixed #58)
add support for chunk reference (fixed #58)

fboehm/labnotebook,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,fboehm/cboettig_site,fboehm/labnotebook,fboehm/labnotebook,fboehm/cboettig_site,antass/labnotebook3,fboehm/labnotebook,fboehm/cboettig_site,antass/labnotebook3,antass/labnotebook3,fboehm/cboettig_site