TY  - RPRT
TI  - OPTICAL DENSITY SCALE FOR COLORIMETERS.
AU  - J W KEYSER
AU  - S RAYMOND
PY  - 1964
DO  - 10.1016/0003-2697(64)90213-1
UR  - https://pubmed.ncbi.nlm.nih.gov/14239489/
ID  - 14239489
ER  -