# Combine reference citations

I would like the reference citation to appear like [1-4], rather than [1], [2], [3], [4].

Here is my MWE

\documentclass[a4paper,10pt]{book}
\begin{document}

Some text

\bibliographystyle{unsrt}
\bibliography{refer}
\end{document}

How to solve this pooling of citations?

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To achieve this with biblatex you can use the style numeric-comp. –  N.N. Feb 6 '12 at 6:22
use donald arseneau's cite.sty to do this with minimum effort; natbib.sty "sort+compress" option also does the job. see tex.ac.uk/cgi-bin/texfaq2html?label=citesort –  wasteofspace Feb 10 '12 at 15:54