bibliographiesbibtex
When compiling my .tex file, latexmk responds with
Latexmk: Summary of warnings: Latex failed to resolve 2 reference(s) Latex found 1 multiply defined reference(s)
\bibliography{<file>} denotes the name of the <file>.bib that contains your BibTeX references, while \bibliographystyle{<bibstyle>} denotes the style you want your references displayed in. You clearly want one \bibliography only:
\documentclass{article}
\usepackage{filecontents}
\begin{filecontents*}{references.bib}
@article{example,
author = {Knuth, Donald E.},
year = {1986},
title = {The {\TeX} book},
}
\end{filecontents*}
\begin{document}
Alpha particles~\cite{example} (named after and denoted by the first letter in the
Greek alphabet,~$\alpha$) consist of two protons and two neutrons bound
together. This means that an particle is a helium nucleus.
\bibliographystyle{plain}
\bibliography{references}
\end{document}
Best Answer
A reference that has not been found, e.g. you've used
\ref{ex}without a matching\label{ex}or with a matching\label{ex}that has not been found yet. Another run of LaTeX should resolve the latter.Look in the log file for the words
multiplyandundefined.