TY  - RPRT
TI  - Longitudinal studies: comparative conclusions.
AU  - J G Greene
AU  - A P Visser
PY  - 1992
DO  - 10.1016/0378-5122(92)90007-q
UR  - https://pubmed.ncbi.nlm.nih.gov/1565023/
ID  - 1565023
ER  -