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Journal of Applied Behavior Analysis logoLink to Journal of Applied Behavior Analysis
. 1974 Spring;7(1):167–169. doi: 10.1901/jaba.1974.7-167

A note on the absence of a Santa Claus in any known ecosystem: a rejoinder to Willems1

Donald M Baer 1
PMCID: PMC1311659  PMID: 16795462

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