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Vargha, G; Milton, M J T; Heine, H-J*; Martin, B*; Pérez Castorena, A*; Serrano Caballero, V*; Rangel Murillo, F*; Avila Salas, M*; Ramírez Nambo, C*; Pérez Urquiza, M*; Carbajal Alarcón, C*; Jin Chun Woo*,, ; Mace, T*; van der Veen, A*; Wessel, R*; Ziel, P*; Smeulders, D*; Matsumoto, N*; Konopelko, L*; Kustikov, Y* (2007) A preparative comparison using the 'harmonisation' method on standards of synthetic natural gas (CCQM-P87). NPL Report. AS 13