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How to avoid warning messages from hyperref package in LaTex | Computational Environmental Physics Lab (CEPL)
babel: "Token not allowed in a PDF string" warning with layout=counters · Issue #138 · latex3/latex2e · GitHub
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hyperref - Token not allowed in PDF string, caused by a macro with an optional arg? - TeX - LaTeX Stack Exchange
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pdftex - Package hyperref Warning: Token not allowed in a PDF. (using \frac{}{} in Section title} - TeX - LaTeX Stack Exchange
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