@Article{acp-11-13287-2011,
AUTHOR = {R\"ockmann, T. and Brass, M. and Borchers, R. and Engel, A.},
TITLE = {The isotopic composition of methane in the stratosphere: high-altitude balloon sample measurements},
JOURNAL = {Atmospheric Chemistry and Physics},
VOLUME = {11},
YEAR = {2011},
NUMBER = {24},
PAGES = {13287--13304},
URL = {http://www.atmos-chem-phys.net/11/13287/2011/},
DOI = {10.5194/acp-11-13287-2011}
}