Antibody-mediated extraction of the main tetrahydrocannabinol metabolite, 11-nor-Δ9-tetrahydrocannabinol-9-carboxylic acid, from human urine and its identification by gas chromatography—mass spectrometry in the sub-nanogram range
1985 ◽
Vol 342
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pp. 393-398
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2013 ◽
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1989 ◽
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pp. 364
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2000 ◽
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