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Kellerhals, Thomas; Brütsch, Sabina; Sigl, Michael; Knüsel, Stefanie; W.Gäggeler, Heinz; Schwikowski, Margit (2010). Ammonium concentration in ice cores - a new proxy for regional temperature reconstruction? Journal of geophysical research, 115(D16), D16123. Washington, D.C.: American Geophysical Union 10.1029/2009JD012603
