TY  - RPRT
TI  - Aids for determining visual acuity.
AU  - M B RAIFORD
PY  - 1951
DO  - 10.1016/0002-9394(51)91043-4
UR  - https://pubmed.ncbi.nlm.nih.gov/14838071/
ID  - 14838071
ER  -