TY  - RPRT
TI  - Preference for fixed-interval schedules: effects of initial-link length.
AU  - G R Wardlaw
AU  - M C Davison
PY  - 1974
DO  - 10.1901/jeab.1974.21-331
UR  - https://pubmed.ncbi.nlm.nih.gov/16811747/
ID  - 16811747
ER  -