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I am writing my research and it is a literature review about "Using AI applications to fight Coronavirus" I have specified the scope limitation to be "Research published between January 1st, 2019 to January 1st, 2021, since COVID-19 emerged in 2019" The problem here is that I want to identify the definition of AI before I review AI applications and I couldn't find valuable research between 2019 and 2020. Am I allowed to use research published before 2019 in order to write the definition?

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    I'm afraid this is really off-topic for the site. – egreg May 4 at 17:39
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    I’m voting to close this question because it' not related to LaTeX. – SebGlav May 4 at 17:40

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