Hayal Güler, et al. “Comparison of Ketoprofen Phonophoresis With Ketoprofen and Lidocaine- Prilocaine Phonophoresis in Patients With Subacromial Impingement Syndrome”. Archives of Rheumatology, vol. 24, no. 2, June 2009, pp. 088-93, http://anadolupsikiyatri.net/index.php/pub/article/view/300.