Brand, W. A.; Chivulescu, A.; Huang, L.; Mukai, H.; Richter, J.; Rothe, M.: Relating Air-CO₂ Isotope Ratio Determinations to VPDB using Calcite-CO₂ Mixed into CO₂-free Air. In: 14th WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases, and Related Tracer Measurement Techniques. Proceedings of the 14th WMO/IAEA Meeting of Experts on Carbon Dioxide, Other Greenhouse Gases, and Related Tracer Measurement Techniques, Helsinki, Sept. 2007, Helsinki. (2009)

Wendeberg, M.; Richter, J.; Rothe, M.; Brand, W. A.: JRAS isotope reference: A generalized VPDB scale anchor for CO₂ in air? Proceedings of the 15th IAEA/WMO meeting of CO₂ experts, Jena, Sept. 2009., (2009)

Brand, W. A.; Rothe, M.; Richter, J.: Relating Air-CO₂ Isotope Ratio Determinations to VPDB using Calcite-CO₂ Mixed into CO₂-free Air. Proceedings of the 13th IAEA/WMO meeting of CO₂ experts, Boulder, Sept. 2005, Boulder., (2007)

Mukai, H.; Nakazawa, T.; Brand, W. A.; Huang, L.; Levin, I.; Allison, C.; White, J.; Leuenberger, M.; Assonov, S. S.: About disagreements in inter-comparison activities of isotope ratio measurements for CO₂. Proceedings of the 13th IAEA/WMO meeting of CO₂ experts, Boulder, Sept. 2005., (2007)

Jordan, A.; Brand, W. A.: Technical Report: MPI-BGC, Germany. Report of the 11th WMO/IAEA Meeting of Experts on Carbon Dioxide Concentration and Related Tracer Measurement Techniques (Tokyo, Japan, 25. - 28. September 2001)., (2003)