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Julian Zelizer, The Presidency of Barack Obama: A First Historical Assessment, Princeton University Press. 2018.
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Martin Plaut and Sue Onslow, Robert Mugabe, Ohio University, 2018.
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Serhiy Kudelia, ‘Presidential activism and government termination in dual-executive Ukraine’, Post-Soviet Affairs, Volume 34, Issue 4, 2018, pp. 246-261, https://doi.org/10.1080/1060586X.2018.1465251
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