1. Difficulties in Evaluating Positive Control Trials;Temple,1983
2. Planning and monitoring of equivalence studies;Durrleman;Biometrics,1990
3. Placebo comparisons in active-controlled trials;Gould,1987
4. Considerations for the meta-analysis of randomized clinical trials;Boissel;Controlled Clin Trials,1989
5. Active control trials: Do they address the efficacy issue?;Pledger,1986