TY  - RPRT
TI  - Some methodological aspects of using postal questionnaires with the elderly.
AU  - C R Victor
PY  - 1988
DO  - 10.1016/0167-4943(88)90028-3
UR  - https://pubmed.ncbi.nlm.nih.gov/3415396/
ID  - 3415396
ER  -