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    المصدر: Yafa, C, Farmer, J G, Graham, M C, Bacon, J R, Barbante, C, Cairns, W R L, Bindler, R, Renberg, I, Cheburkin, A, Emons, H, Handley, M J, Norton, S A, Krachler, M, Shotyk, W, Li, X D, Martinez-Cortizas, A, Pulford, I D, MacIver, V, Schweyer, J, Steinnes, E, Sjobakk, T E, Weiss, D, Dolgopolova, A & Kylander, M 2004, ' Development of an ombrotrophic peat bog (low ash) reference material for the determination of elemental concentrations ', Journal of Environmental Monitoring, vol. 6, no. 5, pp. 493-501 . https://doi.org/10.1039/b315647h

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