Werner, R. A.; Schmidt, H.-L.: The in vivo nitrogen isotope discrimination among organic plant compounds. Phytochemistry 61 (5), S. 465 - 484 (2002)

Brand, W. A.; Coplen, T. B.: An interlaboratory study to test instrument performance of hydrogen dual-inlet isotope-ratio mass spectrometers. Fresenius Journal of Analytical Chemistry 370 (4), S. 358 - 362 (2001)

Röckmann, T.; Kaiser, J.; Brenninkmeijer, C. A. M.; Brand, W. A.; Borchers, R.; Crowley, J. N.; Wollenhaupt, M.; Crutzen, P. J.: The position dependent ¹⁵N enrichment of the nitrous oxide in the stratosphere. Isotopes in Environmental and Health Studies 37, S. 91 - 95 (2001)

Röckmann, T.; Kaiser, J.; Brenninkmeijer, C. A. M.; Crowley, J. N.; Borchers, R.; Brand, W. A.; Crutzen, P. J.: Isotopic enrichment of nitrous oxide (¹⁵N¹⁴NO, ¹⁴N¹⁵NO, ¹⁴N¹⁴N¹⁸O) in the stratosphere and in the laboratory. Journal of Geophysical Research: Atmospheres 106 (10), S. 10403 - 10410 (2001)

Schmidt, H.-L.; Werner, R. A.; Roßmann, A.: ¹⁸O pattern and biosynthesis of natural plant products. Phytochemistry 58 (1), S. 9 - 32 (2001)

Werner, R. A.; Braeunlich, S.; Brand, W. A.: On-line determination of δ ¹⁸O in silicates, carbonates and other inorganic substances: First results. Abstracts of Papers of the American Chemical Society 221, S. 98 - GEOC (2001)

Werner, R. A.; Brand, W. A.: Referencing strategies and techniques in stable isotope ratio analysis. Rapid Communications in Mass Spectrometry 15 (7), S. 501 - 519 (2001)

Werner, R. A.; Rothe, M.; Brand, W. A.: Extraction of CO₂ from air samples for isotopic analysis and limits to ultra high precision δ¹⁸O determination in CO₂ gas. Rapid Communications in Mass Spectrometry 15, S. 2152 - 2167 (2001)

Hilkert, A. W.; Douthitt, C. B.; Schlüter, H. J.; Brand, W. A.: Isotope ratio monitoring gas chromatography / mass spectrometry of D/H by high temperature conversion isotope ratio mass spectrometry. Rapid Communications in Mass Spectrometry 13 (13), S. 1226 - 1230 (1999)

Kornexl, B. E.; Gehre, M.; Höfling, R.; Werner, R. A.: On-line δ ¹⁸O measurement of organic and inorganic substances. Rapid Communications in Mass Spectrometry 13 (16), S. 1685 - 1693 (1999)