Şenay Özdolap, et al. “INFLUENCE OF DISEASE ACTIVITY AND CHRONICITY ON BONE MINERAL DENSITY IN ANKYLOSING SPONDYLITIS”. Archives of Rheumatology, vol. 19, no. 1, Mar. 2004, pp. 037-42, http://anadolupsikiyatri.net/index.php/pub/article/view/128.