TY  - RPRT
TI  - Observer variation in ophthalmology.
AU  - R A Gibson
AU  - H F Sanderson
PY  - 1980
DO  - 10.1136/bjo.64.6.457
UR  - https://pubmed.ncbi.nlm.nih.gov/7387972/
ID  - 7387972
ER  -