Zotero – exporting Unicode and LaTeX constructs to BibTex

Zotero is a great reference manager, especially if you’re using Firefox. Its BibTeX export is invaluable for LaTeX / LyX users. However, it has a couple of sticking points whose solutions are not well documented. These issues can be especially annoying for researchers working in exact sciences (math, physics, etc.)

Problem 1: Article info contains special Unicode characters (such as é). As BibTeX doesn’t support Unicode, LaTeX compilation fails.


  1. Zotero Preferences -> Export -> check Display character encoding option on export
  2. Whenever you export your database, pick a non-Unicode character encoding such as ISO-8859-1

Zotero will now convert the Unicode characters to their native LaTeX equivalents (for example, é will be converted into ‘{e}).

Note: You could also solve this on the LaTeX side by using Biblatex and biber. However, I wasn’t able to make them work under LyX.

Problem 2:Article info contains Latex constructs (e.g. $O_{3}$). Zotero escapes these and so they appear verbatim in the reference (e.g. $O_{3}$ instead of O₃)


  1. Locate your Zotero data directory and open translatorsBibTeX.js with your favorite text editor
  2. Change the following:
     var alwaysMap = {

    to the following:

     var alwaysMap = {
     ">":"{\textgreater}" //,
    // "~":"{\textasciitilde}",
    // "^":"{\textasciicircum}"
    // "\":"{\textbackslash}"
  3. Change the following: 
     value = value.replace(/[|<>~^\]/g, mapEscape).replace(/([#$%&_])/g, "\$1"); 

    to the following:

     value = value.replace(/[|<>]/g, mapEscape).replace(/([#%&])/g, "\$1");  
  4. Save the file.

Escaping of ~, ^, ,$,_ is now disabled, preserving your LaTeX constructs.

References and further reading