TY  - RPRT
TI  - Variable-ratio versus variable-interval schedules: response rate, resistance to change, and preference.
AU  - J A Nevin
AU  - Randolph
AU  - S Holland
AU  - A P McLean
PY  - 2001
DO  - 10.1901/jeab.2001.76-43
UR  - https://pubmed.ncbi.nlm.nih.gov/11516115/
ID  - 11516115
ER  -