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4. Creutzfeldt, W., Track, N. S., Creutzfeldt, C., Arnold, R.: The secretory cycle of the G-cell: ultrastructural and biochemical investigations of the effect of feeding in rats. In: Gastrointestinal Hormones (Ed. J. C. Thompson), pp. 197-211. University of Texas Press 1975.
5. Creutzfeldt, W., Arnold, R., Creutzfeldt, C., Track, N. S.: Mucosal gastrin concentration, molecular forms of gastrin, number and ultrastructure of G-cells in patients with duodenal ulcer. Gut (in press).