TY  - RPRT
TI  - A response key for use with projection-type display units.
AU  - C B Ferster
AU  - E P Holtzman
AU  - W R Leckrone
PY  - 1962
DO  - 10.1901/jeab.1962.5-322
UR  - https://pubmed.ncbi.nlm.nih.gov/16811270/
ID  - 16811270
ER  -