@Article{acpd-6-4995-2006,
AUTHOR = {Lassey, K. R. and Etheridge, D. M. and Lowe, D. C. and Smith, A. M. and Ferretti, D. F.},
TITLE = {Centennial evolution of the atmospheric methane budget: what do the carbon isotopes tell us?},
JOURNAL = {Atmospheric Chemistry and Physics Discussions},
VOLUME = {6},
YEAR = {2006},
NUMBER = {3},
PAGES = {4995--5038},
URL = {http://www.atmos-chem-phys-discuss.net/6/4995/2006/},
ISSN = {1680-7367}
}