@Article{acpd-12-9587-2012,
AUTHOR = {Sapart, C. J. and Martinerie, P. and Chappellaz, J. and van de Wal, R. S. W. and Sperlich, P. and van der Veen, C. and Bernard, S. and Sturges, W. T. and Blunier, T. and Witrant, E. and Schwander, J. and Etheridge, D. and R\"ockmann, T.},
TITLE = {Reconstruction of the carbon isotopic composition of methane over the last 50 yr based on firn air measurements at 11 polar sites},
JOURNAL = {Atmospheric Chemistry and Physics Discussions},
VOLUME = {12},
YEAR = {2012},
NUMBER = {4},
PAGES = {9587--9619},
URL = {http://www.atmos-chem-phys-discuss.net/12/9587/2012/},
DOI = {10.5194/acpd-12-9587-2012}
}