TY - RPRT TI - Automatic apparatus for stimulus presentation and recording in visual threshold experiments. AU - H R BLACKWELL AU - B S PRITCHARD AU - J G OHMART PY - 1954 DO - 10.1364/josa.44.000322 UR - https://pubmed.ncbi.nlm.nih.gov/13152604/ ID - 13152604 ER -