TY  - RPRT
TI  - Meta-analysis: an overview.
AU  - M C Smith
AU  - E Stullenbarger
PY  - 1989
DO  - 10.1177/089431848900200303
UR  - https://pubmed.ncbi.nlm.nih.gov/2674793/
ID  - 2674793
ER  -