1.
- 2nd annual symposium on helicobacter pylori, Cincinnati, Ohio, USA, 6-7 August 1990 / edit. T. A. Bertram. 1991. Vol. 26, Suppl. 181 - Oslo : Universitetsforlaget, 1991 - 73 s.(Scandinavian Journal of Gastroenterology; Suppl. 181) [1, currently available 0, at library only 1]
- Chapters, articles