[Tex/LaTex] Citing multiple references with llncs

bibtexlncs

I am trying to cite two references with the llncs style, but the second comes up as a "?". Any ideas? 

\documentclass{llncs}
\begin{document}

\cite{her1, her2}

\bibliographystyle{splncs03}
\bibliography{paper}
\end{document}

And in paper.bib:

@article {her1,
    title = {Generating structured music for bagana using quality metrics based on Markov models},
    journal = {Expert Systems With Applications},
    volume = {in press},
    year = {2015},
    author = {D. Herremans and S. Weisser and K. S{\"o}rensen and D. Conklin}
}
article {her2,
    title = {Classification and generation of composer-specific music using global feature models and variable neighborhood search},
    journal = {Computer Music Journal},
    volume = {in press},
    year = {2015},
    author = {D. Herremans and K. S{\"o}rensen and David Martens}
}

Comes up as: [1,?] (both references separately do work)

Is there another command I should use?

Best Answer

This work when you add

\usepackage{cite}
Related Question