@Article{bg-3-539-2006, AUTHOR = {K\"ohler, P. and Fischer, H. and Schmitt, J. and Munhoven, G.}, TITLE = {On the application and interpretation of Keeling plots in paleo climate research – deciphering δ$^{13}$C of atmospheric CO$_{2}$ measured in ice cores}, JOURNAL = {Biogeosciences}, VOLUME = {3}, YEAR = {2006}, NUMBER = {4}, PAGES = {539--556}, URL = {http://www.biogeosciences.net/3/539/2006/}, DOI = {10.5194/bg-3-539-2006} }