1. Peer review in health sciences;Godlee,1999
2. Publication decisions and their possible effects on inferences drawn from tests significance - or viceversa;Sterling;J Am Statist Assoc,1959
3. The importance of negative results in psychological research;Smart;Canad Psychol,1964
4. Publication bias and meta-analysis;Smith;Eval Educ,1980
5. Meta-analysis in social research;Glass,1981