Supercritical fluid extraction of pesticides in sediment from the Okavango Delta, Botswana, and determination by gas chromatography with electron capture detection (GC-ECD) and mass spectrometry (GC-MS)
2005 ◽
Vol 53
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pp. 62-69
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1989 ◽
Vol 474
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pp. 388-395
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2012 ◽
Vol 1256
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2004 ◽
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