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


\cite{her1, her2}


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?

2 Answers 2


This work when you add

  • 2
    I think it also works if you do not use a space after comma in cite. \cite{her1,her2}
    – jpv
    Commented Sep 8, 2015 at 10:56

It seems that LNCS is misinterpreting any blank space inside the \cite{ } command as part of the reference. According to this, neither \cite{ her1 } is working.

The correct way of doing it is removing all blank spaces from the citation, like in


You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .