1. Extra-articular manifestations of ankylosing spondylitis;Luthra,1977
2. The clinical spectrum of ankylosing spondylitis;Forouzesh;Clin Orthop,1979
3. Upper lung fibrosis in ankylosing spondylitis;Jessamine;Can Med Assoc J,1968
4. Fibrocavitating pulmonary lesions in ankylosing spondylitis;Hurwitz;S Afr Med J,1982
5. The chest radiograph in ankylosing spondylitis;Chakera;Clin Radiol,1975