Zhou, Z Y*; Han, Q*; Wang, D F*; Mace, T*; Kipphardt, H*; Maiwald, M*; Tuma, D*; Uehara, S*; Akima, D*; Shimosaka, T*; Jung, J*; Oh, S H*; van der Veen, A*; van Wijk, A I T*; Ziel, P R*; Konopelko, L*; Valkova, M*; Mogale, D M*; Botha, A*; Brewer, P; Murugan, A; Minnaro, M D; Miller, M; Guenther, F*; Kelly, M E* (2016) International comparison CCQM-K101: oxygen in nitrogen - a track B comparison and that the matrix contains argon. Metrologia, 53 (1A). 08013.