TY  - RPRT
TI  - Binocular direct ophthalmoscope.
AU  - D D Donaldson
PY  - 1969
DO  - 10.1001/archopht.1969.00990020773010
UR  - https://pubmed.ncbi.nlm.nih.gov/5355266/
ID  - 5355266
ER  -