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Valkiers, S*; Varlam, M*; Ruße, K*; Berlund, M*; Taylor, P*; Wang, J; Milton, M J T; De Bièvre, P* (2007) Preparation of synthetic isotope mixtures for the calibration of carbon and oxygen isotope ratio measurement (in carbon dioxide) to the SI. Int. J Mass Spectrom., 264 (1). pp. 10-21.