1. The American College of Rheumatology criteria for classification and reporting of osteoarthritis of the hip;Altman;Arthritis Rheum,1991
2. Validation study of WOMAC: a health status instrument for measuring clinically important patient relevant outcomes to antirheumatic drug therapy in patients with osteoarthritis of the hip and kenn;Bellamy;J Rheumatol,1988
3. Etude clinique de 630 cas s'arthrose traite par le nebulisat aqueux d'Harpagophytum procumbens (Radix);Belaiche;Phytotherapy,1982
4. The complete German Commission E Monographs;Blumenthal,1998
5. Ergebnisse zweier randomisierter kontrollierter Studien und einer Anwendungsbeobachtung mit Teufelskrallenextrakt;Biller,2002