Difiore, P.J., D.M. Sigman, T.W. Trull, M.J. Lourey, K. Karsh, G. Cane, and R. Ho. 2006. “Nitrogen Isotope Constraints on Subantarctic Biogeochemistry”. Journal of Geophysical Research: Oceans 111. Blackwell Publishing Ltd. doi:10.1029/2005JC003216.

Sigman, D.M., J. Granger, P.J. Difiore, M.F. Lehmann, R. Ho, G. Cane, and A. van Geen. 2006. “Erratum: ‘Coupled Nitrogen and Oxygen Isotope Measurements of Nitrate Along the Eastern North Pacific Margin’ (Global Biogeochemical Cycles (2005) Vol. 19 10.1029 2005GB002458)”. Global Biogeochemical Cycles 20. doi:10.1029/2005GB002682.

Lehmann, M.F., D.M. Sigman, D.C. McCorkle, B.G. Brunelle, S. Hoffmann, M. Kienast, G. Cane, and J. Clement. 2005. “Origin of the Deep Bering Sea Nitrate Deficit: Constraints from the Nitrogen and Oxygen Isotopic Composition of Water Column Nitrate and Benthic Nitrate Fluxes”. Global Biogeochemical Cycles 19. doi:10.1029/2005GB002508.

Sigman, D.M., J. Granger, P.J. Difiore, M.M. Lehmann, R. Ho, G. Cane, and A. van Geen. 2005. “Coupled Nitrogen and Oxygen Isotope Measurements of Nitrate Along the Eastern North Pacific Margin”. Global Biogeochemical Cycles 19. American Geophysical Union. doi:10.1029/2005GB002458.

Lehmann, M.F., D.M. Sigman, D.C. McCorkle, J. Granger, S. Hoffmann, G. Cane, and B.G. Brunelle. 2007. “The Distribution of Nitrate 15N 14N in Marine Sediments and the Impact of Benthic Nitrogen Loss on the Isotopic Composition of Oceanic Nitrate”. Geochimica Et Cosmochimica Acta 71: 5384-5404. doi:10.1016/j.gca.2007.07.025.