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Hu, Tao & Corey, E.J. (2002). «Short Syntheses of (±)-δ-Araneosene and Humulene Utilizing a Combination of Four-Component Assembly and Palladium-Mediated Cyclization». Organic Letters4 (14): 2441–2443. doi:10.1021/ol026205p. PMID12098267.
Passosa, G.F.Σφάλμα έκφρασης: Μη αναγνωρισμένη λέξη "etal" (2007). «Anti-inflammatory and anti-allergic properties of the essential oil and active compounds from Cordia verbenacea». Journal of Ethnopharmacology110 (2): 323–333. doi:10.1016/j.jep.2006.09.032. PMID17084568.
Fernandes E.S.; Passos G.F.; Medeiros R.; da Cunha F.M.; Ferreira J.; Campos M.M.; Pianowski L.F.; Calixto J.B. (2007). «Anti-inflammatory effects of compounds alpha-humulene and (−)-trans-caryophyllene isolated from the essential oil of Cordia verbenacea». European Journal of Pharmacology569 (3): 228–236. doi:10.1016/j.ejphar.2007.04.059. PMID17559833.
Hillig, Karl W (October 2004). «A chemotaxonomic analysis of terpenoid variation in Cannabis». Biochemical Systematics and Ecology32 (10): 875–891. doi:10.1016/j.bse.2004.04.004. ISSN0305-1978.