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Beuth J (december 2008). ”Proteolytic enzyme therapy in evidence-based complementary oncology: fact or fiction?”. Integrative Cancer Therapies 7 (4): sid. 311–316. doi:10.1177/1534735408327251. PMID 19116226.
Guo R, Canter PH, Ernst E (oktober 2006). ”Herbal medicines for the treatment of rhinosinusitis: a systematic review”. Otolaryngology–Head and Neck Surgery 135 (4): sid. 496–506. doi:10.1016/j.otohns.2006.06.1254. PMID 17011407.