TY  - RPRT
TI  - Basic and applied research on choice responding.
AU  - W W Fisher
AU  - J E Mazur
PY  - 1997
DO  - 10.1901/jaba.1997.30-387
UR  - https://pubmed.ncbi.nlm.nih.gov/9316255/
ID  - 9316255
ER  -