Ohenoja E, Jokiranta J, Mäkinen T, Kaikkonen A, Airaksinen MM (1987). "The occurrence of psilocybin and psilocin in Finnish fungi". Journal of Natural Products. 50 (4): 741–44. doi:10.1021/np50052a030. PMID3430170.
Akers, Brian P.; Ruiz, Juan Francisco; Piper, Alan; Ruck, Carl A. P. (June 2011). "A Prehistoric Mural in Spain Depicting Neurotropic Psilocybe Mushrooms?1". Economic Botany. 65 (2): 121–128. doi:10.1007/s12231-011-9152-5. S2CID3955222.
Paul L. Schiff, Jr. (2002). "Opium and its alkaloids". American Journal of Pharmaceutical Education. Archived from the original on October 21, 2007. Retrieved May 8, 2007.
Ohenoja E, Jokiranta J, Mäkinen T, Kaikkonen A, Airaksinen MM (1987). "The occurrence of psilocybin and psilocin in Finnish fungi". Journal of Natural Products. 50 (4): 741–44. doi:10.1021/np50052a030. PMID3430170.
Akers, Brian P.; Ruiz, Juan Francisco; Piper, Alan; Ruck, Carl A. P. (June 2011). "A Prehistoric Mural in Spain Depicting Neurotropic Psilocybe Mushrooms?1". Economic Botany. 65 (2): 121–128. doi:10.1007/s12231-011-9152-5. S2CID3955222.
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Paul L. Schiff, Jr. (2002). "Opium and its alkaloids". American Journal of Pharmaceutical Education. Archived from the original on October 21, 2007. Retrieved May 8, 2007.