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Bedard, L.Paul; Esbensen, Kim H.; Barnes, Sarah-Jane . (2016). An empirical approach for estimating reference material heterogeneity and sample minimum test portion mass for ‘nuggety’ precious metals (Au, Pd, Ir, Pt, Ru). Analytical Chemistry, (), acs.analchem.5b03574–. doi:10.1021/acs.analchem.5b03574 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research