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P.P.P.P.ShengP.P.P.P., T.H.T.H.EtsellT.H.T.H., Recovery of gold from computer circuit board scrap using aqua regia, „Waste Management & Research”, 25 (4), 2007, s. 380–383, DOI: 10.1177/0734242X07076946, PMID: 17874665(ang.).