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Böhlke, J.K., and Coplen, T.B., 1995, Interlaboratory comparison of reference materials for nitrogen-isotope-ratio measurements, in Reference and intercomparison materials for stable isotopes of light elements: Vienna, International Atomic Energy Agency, IAEA-TECDOC-825, p. 51-66.
Böhlke, J.K., Gwinn, C.J., and Coplen, T.B., 1993, New reference materials for nitrogen-isotope-ratio measurement: Geostandards Newsletter, v. 17, p. 159-164.
Böhlke, J. K., Mroczkowski, S. J., and Coplen, T. B., 2003, Oxygen isotopes in nitrate: new reference materials for 18O:17O:16O measurements and observations on nitrate-water equilibration: Rapid Communications in Mass Spectrometry, v. 17, p. 1835-1846.
Brand, W. A., Coplen, T. B., Aerts-Bijma, A. T., Böhlke, J. K., Gehre, M., Geilmann, H., Gröning, M., Jansen, H. G., Meijer, H. A. J., Mroczkowski, S. J., Qi, H., Soergel, K., Stuart-Williams, H., Weise, S. M., and Werner, R. A., 2009, Comprehensive inter-laboratory calibration of reference materials for δ18O versus VSMOW using various on-line high-temperature conversion techniques, Rapid Communications in Mass Spectrometry, v. 23, no. 7, p. 999-1019.
Carmody, R.W., and Seal II, R.R., 1999, Evaluation of the sulfur isotopic composition and homogeneity of the Soufre de Lacq reference material: Chemical Geology, v. 153, p. 289-295. (on-line abstract)
Coplen, T.B., Brand, W.A., Gehre, M., Gröning, M., Meijer, H.A.J., Toman, B., and Verkouteren, R.M., 2006, After two decades a second anchor for the VPDB δ13C scale: Rapid Communications in Mass Spectrometry, v. 20, p. 3165-3166.
Coplen, T.B., Brand, W.A., Gehre, M., Gröning, M., Meijer, H. A. J., Toman, B, and Verkouteren, R. M., in press, New guidelines for δ13C measurements: Analytical Chemistry.
Coplen, T. B., and Clayton, R. N., 1973, Hydrogen isotopic composition of NBS and IAEA stable isotope water reference samples: Geochimica Cosmochimica Acta, v. 37, p. 2347-2349.
Coplen, T. B., Friedman, I., and O'Neil, J. R., 1984, Comment on Advisory Group Meeting on Stable Isotope Reference Samples for Geochemical and Hydrological Investigation, Vienna, Austria, 19–21 September 1983, (report to the Director General, International Atomic Energy Agency, 77 p.): U.S. Geological Survey, Water Resources Investigation 84 4136, 8 p.
Coplen, T.B. and Hopple, J.A., 1995, Audit of VSMOW distributed by the United States National Institute of Standards and Technology, in Reference and intercomparison materials for stable isotopes of light elements: Vienna, International Atomic Energy Agency, IAEA-TECDOC-825, p. 35-38.
Coplen, T. B., Kendall, C., and Barnes, I. L., 1982, Comment on Two new carbonate stable isotope standards, by Irving Friedman, James O'Neil, and Gerald Cebula, 1982, (in Geostandards Newsletter, v. 6, p. 11-12): Geostandards Newsletter, v. 6, p. 257-258.
Coplen, T. B., and Kendall, C., 1982, Preparation and stable isotope determination of NBS-16 and NBS-17 carbon dioxide reference samples: Analytical Chemistry, v. 54, p. 2611-2612.
Coplen, T. B., Kendall, C., and Hopple, J., 1983, Intercomparison of stable isotope reference samples: Nature, v. 302, p. 236-238.
Qi, H., Coplen, T.B., Geilmann, H., Brand, W.A., and Böhlke, J.K., 2003, Two new organic reference materials for δ13C and δ15N measurements and a new value for the δ13C of NBS 22 oil: Rapid Communications in Mass Spectrometry, v. 17, p. 2483-2487.
Qi, H.P., and Coplen, Tyler B., 2003, Evaluation of the 34S/32S ratio of Soufre de Lacq elemental sulfur isotopic reference material by continuous flow isotope-ratio mass spectrometry: Chemical Geology, v. 199, p. 183-187. (on-line abstract)
Qi, H.P., Gröning, M., Coplen, T.B., Buck, B., Mroczkowski, S.J., Brand, W.A., Geilmann, H., and Gehre, M., 2010, Novel silver-tubing method for quantitative introduction of water into high-temperature conversion systems for stable hydrogen and oxygen isotopic measurements, Rapid Communications in Mass Spectrometry, v. 24, no. 13, p. 1821–1827. (on-line article)