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Zipf RK Jr, Ochsner R, Krog R, Marchewka W, Valente M, Jensen R.Zipf RK Jr, et al. Among authors: marchewka w.Trans Soc Min Metall Explor Inc. 2014 Mar;334:489-497.Trans Soc Min Metall Explor Inc. 2014.PMID: 26306075Free PMC article.