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Legrand, M.; De Angelis, M.; Staffelbach, T.; Neftel, A.; Stauffer, B. (1992). Large perturbations of ammonium and organic acids content in the Summit-Greenland ice core. Fingerprint from forest fires? Geophysical Research Letters, 19(5), pp. 473-475. American Geophysical Union 10.1029/91GL03121
