Werner, R. A., Bruch, B. A., & Brand, W. A. (1999). ConFlo III - an interface for high precision δ13C and δ15N analysis with an extended dynamic range. Rapid Communications in Mass Spectrometry, 13(13), 1237–1241. https://doi.org/10.1002/(sici)1097-0231(19990715)13:13<1237::aid-rcm633>3.0.co;2-c