T.  Palaniselvam, Valappil, M. Ozhukil, Illathvalappil, R., and Kurungot, S., ?Nanoporous graphene by quantum dots removal from graphene and its conversion to a potential oxygen reduction electrocatalyst via nitrogen doping?, Energy & Environmental Science, vol. 7, no. 7, pp. 1059-1067, 2014.