Turnbull, B.Jennison, C.2007-11-092007-11-091989-10869https://hdl.handle.net/1813/8752This paper published in "SIAM Journal on Discrete Mathematics" 4, (1991), 436-4475506168 bytesapplication/pdfen-USOperations ResearchIndustrial Engineeringtechnical reportStatistical Approaches to Interim Monitoring of Medical Trials: A Review and Commentarytechnical report