TY  - RPRT
TI  - Distribution of response ratios in concurrent variable-interval performance.
AU  - R D Tustin
AU  - M C Davison
PY  - 1978
DO  - 10.1901/jeab.1978.29-561
UR  - https://pubmed.ncbi.nlm.nih.gov/16812078/
ID  - 16812078
ER  -