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Teaching coin equivalence to the mentally retarded.
Trace MW, Cuvo AJ, Criswell JL. Trace MW, et al. J Appl Behav Anal. 1977 Spring;10(1):85-92. doi: 10.1901/jaba.1977.10-85. J Appl Behav Anal. 1977. PMID: 845100 Free PMC article.