Brand, Willi A. Service Facility Stable Isotope, Dr. W. A. Brand, Max Planck Institute for Biogeochemistry, Max Planck Society;
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Coplen, T. B., Brand, W. A., Meija, J., Gröning, M., Holden, N. E., Berglund, M., et al. (2013). Atomic weights of the elements 2013 (xls). http://www.ciaaw.org/.
