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I submitted a paper recently and one of the major revisions that they ask for was this: "The references in general are not current."
What does the reviewer mean by this?
Your references apparently refer to literature that is too old, and probably superseded by more recent research.
Look for more recent work pertinent to your topic and include it in your paper.
In mathematics, papers are often cited when they are preprints (usually on the arxiv).
If your references cite the preprint version of a paper when it has already appeared in a journal, they are not current.
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