Altieri, K.E., M.G. Hastings, A.J. Peters, and D.M. Sigman. 2012. “Molecular Characterization of Water Soluble Organic Nitrogen in Marine Rainwater by Ultra-High Resolution Electrospray Ionization Mass Spectrometry”. Atmospheric Chemistry and Physics 12: 3557-71. doi:10.5194/acp-12-3557-2012.

Silver, B.J., R. Raymond, D.M. Sigman, M. Prokopeko, Sherwood Lollar, G. Lacrampe-Couloume, M.L. Fogel, L.M. Pratt, L. Lefticariu, and T.C. Onstott. 2012. “The Origin of NO 3 - and N 2 in Deep Subsurface Fracture Water of South Africa”. Chemical Geology 294-295: 51-62. doi:10.1016/j.chemgeo.2011.11.017.

Brookshire, E.N.J., L.O. Hedin, J.D. Newbold, D.M. Sigman, and J.K. Jackson. 2012. “Sustained Losses of Bioavailable Nitrogen from Montane Tropical Forests”. Nature Geoscience 5: 123-26. doi:10.1038/ngeo1372.

Wolff, C., G.H. Haug, A. Timmermann, J.S. Sinninghe Damsté, A. Brauer, D.M. Sigman, M.A. Cane, and D. Verschuren. 2011. “Reduced Interannual Rainfall Variability in East Africa During the Last Ice Age”. Science 333: 743-47. doi:10.1126/science.1203724.

Knapp, A.N., M.G. Hastings, D.M. Sigman, F. Lipschultz, and J.N. Galloway. 2010. “The Flux and Isotopic Composition of Reduced and Total Nitrogen in Bermuda Rain”. Marine Chemistry 120: 83-89. doi:10.1016/j.marchem.2008.08.007.

Houlton, B.Z., D.M. Sigman, E.A.G. Schuur, and L.O. Hedin. 2007. “A Climate-Driven Switch in Plant Nitrogen Acquisition Within Tropical Forest Communities”. Proceedings of the National Academy of Sciences of the United States of America 104: 8902-6. doi:10.1073/pnas.0609935104.

Houlton, B.Z., D.M. Sigman, and L.O. Hedin. 2006. “Isotopic Evidence for Large Gaseous Nitrogen Losses from Tropical Rainforests”. Proceedings of the National Academy of Sciences of the United States of America 103: 8745-50. doi:10.1073/pnas.0510185103.

Hastings, M.G., D.M. Sigman, and E.J. Steig. 2005. “Glacial/Interglacial/Changes/in/the/Isotopes/of/Nitrate/from/the/Greenland/Ice/Sheet/Project/2/(GISP2)/Ice/Core”. Global Biogeochemical Cycles 19. doi:10.1029/2005GB002502.

Hastings, M.G., E.J. Steig, and D.M. Sigman. 2004. “Seasonal Variations in N and O Isotopes of Nitrate in Snow at Summit, Greenland: Implications for the Study of Nitrate in Snow and Ice Cores”. Journal of Geophysical Research D: Atmospheres 109: 1-11. doi:10.1029/2004JD004991.

Hastings, M.G., D.M. Sigman, and F. Lipschultz. 2003. “Isotopic Evidence for Source Changes of Nitrate in Rain at Bermuda”. Journal of Geophysical Research: Atmospheres 108. Blackwell Publishing Ltd: 22-1. doi:10.1029/2003jd003789.