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Hi:-)

Who is "who" in "depending on who you read"?

Does it refer to "depending on whose article you read?"
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Yes, but more specifically, it means "whose opinion you follow."

There can be two "experts" who disagree on something and if you read articles by one and are guided by HIS opinion, you wil have different thoughts than if you read what the other person writes and are guided by HER opinion.
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I think you are right
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 BarbaraPA's reply was promoted to an answer.
Thanks!