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Journal of the Experimental Analysis of Behavior|November 1, 1987
A comparison of response patterns on fixed-, variable-, and random-ratio schedulesE K Crossman, E J Bonem, B J Phelps
The Gerontologist|December 1, 1993
Sundown syndrome: is it reflected in the use of PRN medications for nursing home residents?M E Exum, B J Phelps, K E Nabers, et al.
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