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1.- Selenium and other trace element in phosphorites; a comparison between those of the Bayovar-Sechura and other provenances Elsevier; Amsterdam-New York; III; International, 2010 Selenium and iodine anomalies in soils and health Ver registro
2.- THE PETROLEUM SYSTEM; A FUNDAMENTAL TOOL PENNWELL; TULSA, OK; USA; UNITED STATES, 2003 Ver registro
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