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Srivastava, A; Chartrand, M M G; Camin, F; Mohn, J; Sperlich, P; Rennick, C; Hill-Pearce, R; Persijn, S; Nehrbass-Ahles, C; Nwaboh, J (2025) Developing calibration and measurement capabilities for atmospheric CH 4 stable isotope ratios at NMIs/DIs: metrology for global comparability. Metrologia, 62 (3). 032001 ISSN 0026-1394