TY  - RPRT
TI  - Epidemiological issues in mental retardation.
AU  - T Fryers
PY  - 1987
DO  - 10.1111/j.1365-2788.1987.tb01382.x
UR  - https://pubmed.ncbi.nlm.nih.gov/3325650/
ID  - 3325650
ER  -