TY  - RPRT
TI  - Preference between variable-ratio and fixed-ratio schedules: local and extended relations.
AU  - D P Field
AU  - F Tonneau
AU  - W Ahearn
AU  - P N Hineline
PY  - 1996
DO  - 10.1901/jeab.1996.66-283
UR  - https://pubmed.ncbi.nlm.nih.gov/8921612/
ID  - 8921612
ER  -