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Blunier, T.; Chappellaz, J. A.; Schwander, J.; Barnola, J.-M.; Desperts, T.; Stauffer, B.; Raynaud, D. (1993). Atmospheric methane, record from greenland ice core over the last 1000 years. Geophysical Research Letters, 20(20), pp. 2219-2222. American Geophysical Union 10.1029/93GL02414
