J.E. Crabtree, J.D. Taylor, R.V. Heatley, T.M. Shallcross, B.J. Rathbone, J.I. Wyatt, D.S. Tompkins,
Mucosal IgA recognition of Helicobacter pylori 120 kDa protein, peptic ulceration, and gastric pathology The Lancet. ,vol. 338, pp. 332- 335 ,(1991) ,
10.1016/0140-6736(91)90477-7