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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
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 2.- THE PETROLEUM SYSTEM; A FUNDAMENTAL TOOL
PENNWELL; TULSA, OK; USA; UNITED STATES, 2003
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