1. Non-specific low back pain
2. Committee for Proprietary Medicinal Products (CPMP).2002.Note for guidance on clinical investigation of medicinal products for treatment of nociceptive pain. CPMP/EWP/612/00.http://www.tga.gov.au/pdf/euguide/ewp061200final.pdf accessed Nov 4 2011.
3. Comfrey extract ointment in comparison to a diclofenac gel in the treatment of acute unilateral ankle sprains (distortions);D'Anchise R;Arzneim‐Forsch Drug Res,2007
4. Guidelines for clinical studies assessing the efficacy of drugs for the management of acute low back pain;Devogelaer JP;Clin Exp Rheumatol,2003
5. Symphytum officinale L. - der Beinwell in der europäischen Pharmazie- und Medizingeschichte