RT Journal Article SR Electronic T1 Double-blind cross-over comparison of indomethacin, flurbiprofen, and placebo in ankylosing spondylitis. JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 129 OP 131 DO 10.1136/ard.33.2.129 VO 33 IS 2 A1 R D Sturrock A1 F D Hart YR 1974 UL http://ard.bmj.com/content/33/2/129.abstract AB