TY  - RPRT
TI  - Pause relationships in multiple and chained fixed-ratio schedules.
AU  - E K Crossman
PY  - 1968
DO  - 10.1901/jeab.1968.11-117
UR  - https://pubmed.ncbi.nlm.nih.gov/5645867/
ID  - 5645867
ER  -