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Flores, E*; Viallon, J*; Choteau, T*; Moussay, P*; Wielgosz, R I*; Kang, N*; Kim, B M*; Zalewska, E*; van der Veen, A*; Konopelko, L*; Wu, H*; Han, Q*; Rhoderick, G*; Guenther, F R*; Watanabe, T*; Shimosaka, T*; Kato, K*; Hall, B*; Brewer, P J (2015) International comparison CCQM-K82: methane in air at ambient level (1800 to 2200) nmol/mol. Metrologia, 52 (1A). 08001.