1. Meta-analysis in social research;Glass,1981
2. Summing up: the science of reviewing research;Light,1984
3. Meta-analyses of randomized controlled trials;Sacks;New Engl J Med,1987
4. Meta-analytic stimulus for changes in clinical trials;Chalmers;Stat Methods Med Res,1993
5. Effective care in pregnancy and childbirth;Chalmers,1989