TY  - RPRT
TI  - A free-choice version of the EPPS.
AU  - R I Lanyon
PY  - 1966
DO  - 10.1002/1097-4679(196604)22:2<202::aid-jclp2270220225>3.0.co;2-2
UR  - https://pubmed.ncbi.nlm.nih.gov/5937049/
ID  - 5937049
ER  -