TY  - RPRT
TI  - International comparisons.
AU  - W O Hagstrom
AU  - L L Hargens
PY  - 1969
DO  - 10.1126/science.164.3875.13
UR  - https://pubmed.ncbi.nlm.nih.gov/5773705/
ID  - 5773705
ER  -