Author ref help

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• (ref "multi-2_themes-sec1" "multi-2" "page2" "opposing" "op1")
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• (ref "multi-2_themes-sec2" "multi-2" "sec2" "section-title" "1")
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• (ref "multi-2_themes-sec2" "multi-2" "page3" "language-syntax" "sy1")
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• (ref "multi-2_themes-sec2" "multi-2" "page4" "items" "it1")
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