TY  - RPRT
TI  - Sight-screener calibration study.
AU  - V I RYAN
AU  - J ROBERTS
PY  - 1963
DO  - 10.1097/00006324-196304000-00001
UR  - https://pubmed.ncbi.nlm.nih.gov/13975772/
ID  - 13975772
ER  -