1. Alvarez, W. C: Minn. Med. 14, 296 (1931).
2. Azad Khan, A. K., Howes, D. T., Piris, J., Truelove, S. C: Optimal dose of sulphasalazine for the maintenance treatment of ulcerative colitis: interim results of a controlled therapeutic trial. Gut 18, 421–422 (1977).
3. Azad Khan, A. K., Piris, J., Truelove, S. C: An experiment to determine the active therapeutic moiety of sulphasalazine. Lancet 1977 II, 892–895.
4. Baron, J. H. et al.: Sulphasalazine in asymptomatic Crohn’s disease. A multicentre trial. Gut 18, 69–72 (1977).
5. Binder, S., Patterson, J. F., Glotzer, D.: Toxic megacolon in ulcerative colitis. Gastroenterology 66, 909 (1974).