1. Medical ethics and controlled trials;Hill;BMJ,1963
2. Allocation of subjects in medical experiments;Weinstein;N Engl J Med,1974
3. The evaluation of therapies: historical control studies;Gehan;Stat Med,1984
4. Of mice but not of men;Hellman;N Engl J Med,1991
5. The need for early randomization in the development of new drugs for AIDS;Chalmers;J Acquir Immune Defic Syndr,1990