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Brewer, P J; Kim, J S; Lee, S; Tarasova, O A; Viallon, J; Flores, E; Wielgosz, RI; Shimosaka, T; Assonov, S; Allison, CE; van der Veen, A M H; Hall, B; Crotwell, A M; Rhoderick, G C; Hodges, J T; Mohn, J; Zellweger, C; Moossen, H; Ebert, V; Griffith, D W T (2019) Advances in reference materials and measurement techniques for greenhouse gas atmospheric observations. Metrologia, 56 (3). 034006 ISSN 0026-1394