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APA Citation
Mellis, A. M., Woodford, A. E., Stein, J. S., & Bickel, W. K. (n.d.). a second type of magnitude effect: Reinforcer magnitude differentiates delay discounting between substance users and controls. Journal of the experimental analysis of behavior, 107(1), 151–160. http://access.bl.uk/ark:/81055/vdc_100040605825.0x000041