TY  - RPRT
TI  - Inter-observer variation in refraction and visual acuity measurement using a standardized protocol.
AU  - R Klein
AU  - B E Klein
AU  - S E Moss
AU  - D DeMets
PY  - 1983
DO  - 10.1016/s0161-6420(83)34382-7
UR  - https://pubmed.ncbi.nlm.nih.gov/6664675/
ID  - 6664675
ER  -