TY  - RPRT
TI  - A comparison of response patterns on fixed-, variable-, and random-ratio schedules.
AU  - E K Crossman
AU  - E J Bonem
AU  - B J Phelps
PY  - 1987
DO  - 10.1901/jeab.1987.48-395
UR  - https://pubmed.ncbi.nlm.nih.gov/16812500/
ID  - 16812500
ER  -