TY  - RPRT
TI  - Old age dependency in historical perspective.
AU  - L Evans
AU  - J B Williamson
PY  - 1988
DO  - 10.2190/r52w-d67y-7lwl-ecpj
UR  - https://pubmed.ncbi.nlm.nih.gov/3073144/
ID  - 3073144
ER  -