- Anti-centromere antibodies (ACA) in systemic sclerosis patients and their relatives: a serological and HLA study. McHugh, N.J., Whyte, J., Artlett, C., Briggs, D.C., Stephens, C.O., Olsen, N.J., Gusseva, N.G., Maddison, P.J., Black, C.M., Welsh, K. Clin. Exp. Immunol. (1994)