1. Akopyants, N. S., Kersulyte, D. and Berg, D. E. (1995) cagil, a new multigene locus associated with virulence in Helicobacter pylori. Gut,37(Suppl. 1), A1.
2. Al. Anon (1959) Gastric ulcer and the ulcer equation. Lancet, i, 1131–1133.
3. Axon, A. T. R. (1991) Helicobacter pylori therapy: effect on peptic ulcer disease. Journal of Gastroenterology and Hepatology, 6, 131–137.
4. Ball, P. A. J. (1961) The secretory background to gastric ulcer. Lancet, i, 1363–1365.
5. Bell, G. D. and Powell, K. U. (1996) Helicobacter pylori reinfection after apparent eradication — the Ipswich experience. Scandinavian Journal of Gastroenterology, 31 (Suppl. 215), 96–104.