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APA Citation
Sanmartí, R., Ercilla, M. G., Brancós, M. A., Cid, M. C., Collado, A., & Rotés-Querol, J. (1987). hLA class II antigens (DR, DQ loci) and peripheral arthritis in ankylosing spondylitis.. Annals of the rheumatic diseases, 46(7), 497–500. http://access.bl.uk/ark:/81055/vdc_100137792476.0x000060