TY  - RPRT
TI  - Letter: Some pitfalls when measuring X-ray quality.
AU  - G M Ardran
AU  - H E Crooks
PY  - 1973
DO  - 10.1259/0007-1285-46-551-1010-b
UR  - https://pubmed.ncbi.nlm.nih.gov/4761134/
ID  - 4761134
ER  -