1. Bean RHD: Treatment of ulcerative colitis with antimetabolites. Br Med J 1:1081–1084, 1966.
2. Bowen GE, Irons GV Jr, Rhodes JB, et al: Early experiences with azathioprine in ulcerative colitis: A note of caution. JAMA 195:460–464, 1966.
3. Brooke BN, Hoffmann DC, Swarbrick ET: Azathioprine for Crohn’s disease. Lancet 2:612–614, 1975.
4. Brooke BN, Javett SL, Davison OW: Further experience with azathioprine for Crohn’s disease. Lancet 2:1050–1053, 1973.
5. Brown CH, Achkar E: Azathioprine therapy for inflammatory bowel disease: A preliminary report. Am J Gastroenterol 54:363–377, 1970.