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- International Atomic Energy Agency (2007) NBS 22, IAEA-CH-3, IAEA-CH-6, IAEA-CH-7, USGS24 reference sheet (3 August 2007). https://nucleus.iaea.org/sites/ReferenceMaterials/Shared%20Documents/ReferenceMaterials/StableIsotopes/NBS-22/RS_NBS22_USGS24_IAEA-CH-3-6-7.pdf.
- US Geological Survey (2019) Report of Stable Isotopic Composition Reference Materials USGS61, USGS62 and USGS63 (Hydrogen, Carbon and Nitrogen Isotopes in Caffeine) (2 December 2019). https://isotopes.usgs.gov/lab/referencematerials/USGS61-USGS62-USGS63.pdf.
- US Geological Survey (2019) Report of Stable Isotopic Composition Reference Materials USGS64, USGS65, USGS66 (Carbon and Nitrogen Isotopes in Glycine) (2 December 2019). https://isotopes.usgs.gov/lab/referencematerials/USGS64-USGS65-USGS66.pdf.
- Assonov, Sergey, Manfred Groening, Ales Fajgelj, Jean‐Francois Hélie, and Claude Hillaire‐Marcel. ‘Preparation and Characterisation of IAEA‐603, a New Primary Reference Material Aimed at the VPDB Scale Realisation for δ13C and δ18O Determination’. Rapid Communications in Mass Spectrometry 34, no. 20 (27 August 2020). https://doi.org/10.1002/rcm.8867.
- Assonov, Sergey, Ales Fajgelj, Jean‐François Hélie, Colin Allison, and Manfred Gröning. ‘Characterisation of New Reference Materials IAEA‐610, IAEA‐611 and IAEA‐612 Aimed at the VPDB δ13C Scale Realisation with Small Uncertainty’. Rapid Communications in Mass Spectrometry 35, no. 7 (18 February 2021). https://doi.org/10.1002/rcm.9014.
- Hélie, Jean-François, Agnieszka Adamowicz-Walczak, Paul Middlestead, Michelle M.G. Chartrand, Zoltán Mester, and Juris Meija. ‘Discontinuity in the Realization of the Vienna Peedee Belemnite Carbon Isotope Ratio Scale’. Analytical Chemistry 93, no. 31 (27 July 2021): 10740–43. https://doi.org/10.1021/acs.analchem.1c02458.
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