* http :// papers. ssrn. com / sol3 / papers. cfm? abstract_id = 372361-Lott's response to the Ayres and Donohue article
* http :// papers. ssrn. com / sol3 / papers. cfm? abstract_id = 778106
* http :// papers. ssrn. com / sol3 / papers. cfm? abstract_id = 1727409
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