T.  Palaniselvam, Biswal, B. P., Banerjee, R., and Kurungot, S., ?Zeolitic imidazolate framework (ZIF)-derived, hollow-core, nitrogen-doped carbon nanostructures for oxygen-reduction reactions in PEFCs?, Chemistry-A European Journal, vol. 19, no. 28, pp. 9335-9342, 2013.