Traceable amount of substance fraction measurements in gases through infrared spectroscopy at PTBNils Lüttschwager, Andrea Pogány, Javis Nwaboh, Alexander Klein, Bernhard Buchholz, Olav Werhahn and Volker EbertInternational Congress of Metrology, (2015) 07005DOI: https://doi.org/10.1051/metrology/20150007005