TY  - RPRT
TI  - A PHOTOMETRIC SYSTEM FOR AUTOMATICALLY READING CONCENTRATION.
AU  - D K MCKAY
AU  - D SELIGSON
AU  - W R JEWETT
PY  - 1964
UR  - https://pubmed.ncbi.nlm.nih.gov/14228270/
ID  - 14228270
ER  -