Features and problems of metrological traceability of gas mixtures using UV absorption, FTIR, and CRD spectroscopyLeonid Konopelko, Vitaly Beloborodov, Ian Chubchenko and Dmitry RumiantsevInternational Congress of Metrology, (2017) 16002DOI: https://doi.org/10.1051/metrology/201716002