TY  - RPRT
TI  - Threshold contrast as a function of target complexity.
AU  - S K Guth
AU  - J F McNelis
PY  - 1969
DO  - 10.1097/00006324-196907000-00002
UR  - https://pubmed.ncbi.nlm.nih.gov/5255766/
ID  - 5255766
ER  -