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Hsu, LM; Huang, YS; Chang, FY; Lee, SD (Jul 2005). “'Fat burner' herb, usnic acid, induced acute hepatitis in a family”. Journal of Gastroenterology and Hepatology20 (7): 1138–9. doi:10.1111/j.1440-1746.2005.03855.x. PMID15955234.
Sanchez, William; Maple, John T.; Burgart, Lawrence J.; Kamath, Patrick S. (2006). “Severe Hepatotoxicity Associated with Use of a Dietary Supplement Containing Usnic Acid”. Mayo Clinic Proceedings81 (4): 541–544. doi:10.4065/81.4.541. PMID16610575.
Blanc, Philippe J. (1996). “Characterization of the tea fungus metabolites”. Biotechnology Letters18 (2): 139–142. doi:10.1007/BF00128667. ISSN0141-5492.