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I am trying to use bibtex to output the url from a reference, but it's not working because the url has accentuation, just like below:

url = {http://www.epe.gov.br/mercado/Documents/Série\%20Estudos\%20de\%20Energia/20130117_1.pdf},

The output is:

http://www.epe.gov.br/mercado/Documents/S\unhbox\voidb@x\ bgroup\let\unhbox\voidb@x\setbox\@tempboxa\hbox{e\global\ mathchardef\accent@spacefactor\spacefactor}\accent19e\ egroup\spacefactor\accent@spacefactorrie%20Estudos%20de% 20Energia/20130117_1.pdf

Is there a way to protect the accentuation when it enters on url environment?

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2 Answers 2

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An URL should not contain accented characters (cf. Uniform resource locator or RFC 3986).

In your URL, replace accented characters by encoded characters:

http://www.epe.gov.br/mercado/Documents/S%C3%A9rie%20Estudos%20de%20Energia/20130117_1.pdf

Edit: Fast reference for encoded characters.

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  • The problem with encoded characters is that they obscures the URL such that one can't know what it actually is without a browser. This might be a problem if the work will be printed and the reader is supposed to enter the URL by hand (and is expected to have the input method for the language).
    – Imperishable Night
    Dec 28, 2017 at 18:31
  • @ImperishableNight Extract from RFC 3986: A URI is composed from a limited set of characters consisting of digits, letters, and a few graphic symbols. This set does not contain any accented character!
    – Paul Gaborit
    Dec 28, 2017 at 23:53
  • Then RFC 3987 happened and defined the Internationalized Resource Identifier (IRI). You may argue that it's not "true" URL (the % escaped sequence is), but every modern browser accepts them, and they made my life browsing Chinese wikis a lot merrier.
    – Imperishable Night
    Dec 29, 2017 at 10:29
  • @ImperishableNight Modern browsers can accept IRIs ... but PDF specifications only know URLs.
    – Paul Gaborit
    Dec 29, 2017 at 23:26
  • Which, I guess, means that we want to show the IRI but jump to the URL when clicked on. I mean, the second part is optional, you can't click on a printed document anyway.
    – Imperishable Night
    Jan 3, 2018 at 13:23
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If I use \usepackage[]{hyperref} before \begin{document} and use in my bibliography e.g. url = {http://www.de.wikipedia.org/wiki/Beyoncé_Knowles}, then everything runs without problems. But it is difficult to say if the hyperref-package helps in your case because you do not tell us which packages you are using.

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