Geng, L., A.J. Schauer, S.A. Kunasek, E.D. Sofen, J. Erbland, J. Savarino, D.J. Allman, R.S. Sletten, and B. Alexander, Analysis of Oxygen-17 Excess of Nitrate and Sulfate at Sub-micromole Levels Using the Pyrolysis Method, Rapid Comm. Mass Spectrom., 27 (21), 2411-2419. doi:10.1002/rcm.6703 (2013)

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Next One:Geng, L., B. Alexander, J. Cole-Dai, E.J. Steig, J. Savarino, E.D. Sofen, and A.J. Schauer, Nitrogen Isotopes in Ice Core Nitrate Linked to Anthropogenic Atmospheric Acidity Change, Proc. Nat. Acad. Sci. (Highlighted in this issue of PNAS), 111 (16), 5808-5812, doi:10.1073/pnas.1319441111 (2014).