TY  - RPRT
TI  - Visual field changes in early glaucoma and how to recognize them.
AU  - A Heijl
PY  - 1989
DO  - 10.1016/0039-6257(89)90062-3
UR  - https://pubmed.ncbi.nlm.nih.gov/2749505/
ID  - 2749505
ER  -