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Our thanks to Edward V. Morse for helpful comments on earlier drafts.
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Sheley, J.F., Hanlon, J.J. Unitended effects of police decisions to actively enforce laws: Implications for analysis of crime trends. Contemporary Crises 2, 265–275 (1978). https://doi.org/10.1007/BF02741895
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DOI: https://doi.org/10.1007/BF02741895