Ho Lim, Sang, et al. “Systematic Evaluation of Uranium Impurities in Process Blanks for Ultra-Trace Analysis on Environmental Safeguards Samples Using MC-ICP-MS and Isotope Dilution Mass Spectrometry”. Asian Journal of Chemistry, vol. 26, no. 13, June 2014, pp. 4070-2, doi:10.14233/ajchem.2014.17718.