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academicons package Your second approach needs xelatex or lualatex to compile. If this is an option, here's a MWE. (I had to load the natbib package to avoid compiling errors.) \documentclass{ifacconf} \usepackage{natbib} \usepackage{academicons} \usepackage{xcolor} \usepackage[hidelinks]{hyperref} \definecolor{idcolor}{HTML}{A6CE39} \newcommand{\orcid}[1]...

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When loading subcaption, it automatically calls \DeclareCaptionSubType{figure} if counter figure is defined. Inside \DeclareCaptionSubType{figure}, command \ext@figure is expanded. (Actually this happens inside the expansion of \caption@@@@declaresublistentry, defined in caption3.sty) new counter subfigure is defined, hence the corresponding command \...

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Do \AtBeginEnvironment{thebibliography}{\linespread{1}\selectfont} Without \selectfont the setting is not enforced. In general, \linespread{<factor>} is to be preferred to \renewcommand{\baselinestretch}{<factor>} even though they essentially do the same thing. In any case, the setting is not enforced until the first (explicit or implicit) \...

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The class defines a default value for \@degreeyear, \@degreemonth and \@copyrightyear. I'm not sure why \@degreeyear has \number\month instead of the expected \number\year, probable oversight. Then it defines a conditional to distinguish whether the copyright year is being set by the user and proceeds to define user level commands for setting dates. If the ...

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you don't have to change anything: you can just put those lines in the class file. You could change \usepackage to \RequirePackage but they have identical definitions so it doesn't matter much which you use.

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