TY  - RPRT
TI  - Are demographic developments influenced by social security?
AU  - J H Nelissen
AU  - P A Van Den Akker
PY  - 1988
DO  - 10.1016/0167-4870(88)90033-5
UR  - https://pubmed.ncbi.nlm.nih.gov/12283106/
ID  - 12283106
ER  -