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I have a problem in referencing an article. The title has some superscript. It is giving error when I

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Msquare
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    Welcome to TeX.SX. Use math mode in your bib-file as you would use in your tex-file. – Johannes_B May 13 '19 at 00:05
  • How to do it? I am new to this environment. – Msquare May 13 '19 at 00:24
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    The proper code for this would be $M^{2}$. But really, you should read some basic documentation about LaTeX math. – barbara beeton May 13 '19 at 00:47
  • Can you tell us what your .bib entry looks like. It would also help if we knew which bibliography style you use (and which bibliography/citation package). Some styles apply additional formatting to titles that could be relevant here. Please add a short example document to your question that reproduces the issue: https://tex.meta.stackexchange.com/q/228/35864, https://tex.meta.stackexchange.com/q/4407/35864. – moewe May 13 '19 at 04:58
  • Does https://tex.stackexchange.com/q/253852/15925 help? – Andrew Swann May 13 '19 at 09:07
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    Is there any news here? – Johannes_B May 19 '19 at 06:18
  • @barbarabeeton $M^{2}$ did work for me. Thanks – Msquare May 19 '19 at 22:15
  • @barbarabeeton Do you want to type up a quick answer here, so we can mark this question as solved? – moewe Jun 25 '19 at 07:12

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Properly coded in-line math can be used in a .bib file.

In the present case the math should be entered as

title = {The {$M^{2}$} algorithm},

Any good introduction to (La)TeX will explain math coding. The braces are meant to disable automatic lowercasing done by some styles, see BibTeX loses capitals when creating .bbl file.

moewe
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barbara beeton
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