TY  - RPRT
TI  - Rigidity: a function of reinforcement history.
AU  - P M Bry
AU  - M M Nawas
PY  - 1969
DO  - 10.2466/pms.1969.29.1.118
UR  - https://pubmed.ncbi.nlm.nih.gov/5355022/
ID  - 5355022
ER  -