1. Rontgenbilden vid spondylarthritis ankylopoetica;0, Andersson;NordMed,1937
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3. Asymptomatic spondylodiscitis; an unusual feature of ankylosing spondylitis;Little, H.; Urowitz, M.B.; Smythe, H.A.; Rosen, P.A.;Arthrit's Rheum,1974
4. The arthritides;Galasko, C.S.B.,1984
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