TY  - RPRT
TI  - Behavioral interactions in multiple variable-interval schedules.
AU  - R D Spealman
AU  - L R Gollub
PY  - 1974
DO  - 10.1901/jeab.1974.22-471
UR  - https://pubmed.ncbi.nlm.nih.gov/16811810/
ID  - 16811810
ER  -