Title	Authors	Year
A gas chromatography/combustion/isotope ratio mass spectrometry system for high-precision ?13C measurements of atmospheric methane extracted from ice core samples. Rapid Communications in Mass Spectrometry, 22, 20, 3261-3269.	Behrens, M., J. Schmitt, K.-U. Richter, M. Bock, U. Richter, L. Levin u. H. Fischer	2008

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