TY  - RPRT
TI  - AN EIGHT-DIFFICULTY-LEVEL DISCRIMINATION PROBLEM.
AU  - W A KENNEDY
AU  - H C WILLCUTT
PY  - 1965
DO  - 10.2466/pms.1965.20.1.26
UR  - https://pubmed.ncbi.nlm.nih.gov/14286533/
ID  - 14286533
ER  -