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I'm writing an article in the article class and I need to put \keywords{} and \pacs{} classification inside the \maketitle enviroment. Are there any package that would help me to do that?

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    \keywords and \pacs aren't defined by default in article. Either you will have to manually redefine \maketitle or use a different class which is designed with commands like \pacs such as revtex. If this is an article to be submitted to a journal then it may be worth looking at how that journal requests submissions to be prepared, often they will specify or provide a specific class. – Dai Bowen Nov 28 '16 at 22:31
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    I took the liberty to remove the greetings from your message, because, on this site, it is not customary to include them in question. Accepting and upvoting answers is the usual way to thank someone who helps you. – GuM Nov 28 '16 at 22:37
  • @GustavoMezzetti, Understood. – Juan Madrigal Nov 28 '16 at 22:50
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    @DaiBowen is right about finding out which class the journal wants, but if you really do need this in article, you do not need to redefine \maketitle manually. The titling package almost certainly would support what you need, given suitable definitions for \keywords and \pacs, of course. – cfr Nov 28 '16 at 22:51
  • @DaiBowen, Yes, I really need them on an {article} class. How can I make a command for this? – Juan Madrigal Nov 28 '16 at 22:56

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