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Johnson JR, Jennison TA, Peat MA, Foltz RL (1984). «Stability of delta 9-tetrahydrocannabinol (THC), 11-hydroxy-THC, and 11-nor-9-carboxy-THC in blood and plasma». Journal of analytical toxicology8 (5): 202-4. PMID6094914. doi:10.1093/jat/8.5.202.