1. When to stop a clinical trial. BMJ7;Pocock, S.J.,1992
2. Sequential analysis;Armitage, P.,1975
3. Cumulative meta-analyses of therapeutic trials for myocardial infarction;Lau, J.; Antman, E.M.; Jiminez-Silva, J.; Kupelnick, B.; Miosteller, F.; Chalmers, T.C.;N EnglJ7 Med,1991
4. When to stop a clinical trial;Pocock, S.J.;BMJ,1992
5. Lung cancer and radon;Miles, D.P.B.;BMJ,1992