\begin{thebibliography}{}

\bibitem[Gražulis et~al., 2009]{Grazulis2009}
Gražulis, S., Chateigner, D., Downs, R.~T., Yokochi, A. F.~T., Quirós, M.,
  Lutterotti, L., Manakova, E., Butkus, J., Moeck, P., and Le~Bail, A. (2009).
\newblock {C}rystallography {O}pen {D}atabase {--} an open-access collection of
  crystal structures.
\newblock {\em Journal of Applied Crystallography}, 42:726--729.

\end{thebibliography}