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Observations of aminium salts in atmospheric nanoparticles and possible climatic implicationsJames N. Smith, Kelley C. Barsanti, Hans R. Friedli, Mikael Ehn, Markku Kulmala, Donald R. Collins, Jacob H. Scheckman, Brent J. Williams, Peter H. McMurry and Barbara J. Finlayson-Pitts · Proceedings of the National Academy of Sciences of the United States of America · 2010