I can't compile after I referred to my .bib-file with the reference:

title = {{Modeling O₂ transport as an integrated system limiting V(O₂MAX}},

Any help?

  • Welcome to TeX.SX! Are you using the old BibTeX or biblatex and Biber?
    – egreg
    Dec 29, 2013 at 14:26
  • If you change the subscript with $_2$, the subscript will be well written.
    – osjerick
    Dec 29, 2013 at 14:46

1 Answer 1


Mathematics and other special constructs need to be entered in special ways in LaTeX. In your case, your wish to use a chemical formula, and one convenient way to enter this is via the \ce command of the mhchem package:

Sample output







with mybib.bib:

  author =   {Author, A. N.},
  title =    {Modeling \ce{O2} transport as an integrated system
                  limiting \ce{V(O2MAX)}},
  journal =  {Chem. J.},
  year =     2000

In your orignal sample, the subscripts are not standard ascii characters, and so not understood by the bibtex program.

  • I can now compile, but it reports undefined control sequence \ce, and the reference is not written with subscript - just O2.
    – user43341
    Dec 29, 2013 at 14:44
  • You need the \usepackage[version=3]{mhchem} command in your main file as in the code above. Dec 29, 2013 at 14:45

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