TY  - RPRT
TI  - An ideal test object for the tangent screen.
AU  - L Frisén
PY  - 1974
DO  - 10.1111/j.1755-3768.1974.tb00390.x
UR  - https://pubmed.ncbi.nlm.nih.gov/4408158/
ID  - 4408158
ER  -