Pelvo-spondylitis ossificans : rheumatoid or ankylosing spondylitis; a roentgenological and clinical guide to its early diagnosis (especially anterior spondylitis) / by Ragnar Romanus and Sven Ydén.

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Ydén, Sven, 1918-

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Pelvo-spondylitis ossificans : rheumatoid or ankylosing spondylitis; a roentgenological and clinical guide to its early diagnosis (especially anterior spondylitis) / by Ragnar Romanus and Sven Ydén.