TY  - RPRT
TI  - Methodological problems with ecological variables.
AU  - R Bendel
PY  - 1971
DO  - 10.1111/j.1365-2788.1971.tb01158.x
UR  - https://pubmed.ncbi.nlm.nih.gov/5098077/
ID  - 5098077
ER  -