Herrero-Beaumont G, Armas, JB, Elswood, J, Will, RK, Calin, A. Selective IgA deficiency and spondyloarthropathy: a distinct disease? Ann Rheum Dis. 1990;49(8):636-7. »PubMed

Herrero-Beaumont G, Elswood, J, Will, R, Armas, JB, Calin, A. Postsalmonella reactive phenomena in 2 patients with ankylosing spondylitis: no modification of the underlying disease. J Rheumatol. 1990;17(2):250-1. »PubMed