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cjw-latex.pdf. - CTAN
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The optparams package
How TeX macros actually work: Part 6 - Overleaf, Editor de LaTeX online
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How TeX macros actually work: Part 6 - Overleaf, Editor de LaTeX online
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Guilherme D. Garcia - Some useful LaTeX macros
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Macros
math mode - How to test if two macros have identical definition - TeX - LaTeX Stack Exchange
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