1. http://northerngraphite.com/graphite-pricing/ . Accessed 22 July 2018
2. https://www.statista.com/statistics/452304/graphite-prices-worldwide-prediction-by-flake-grade/ . Accessed 22 July 2018
3. E.I. Zhmurikov, I.A. Bubnenkov, V.V. Dremov, S.I. Samarin, A.S. Pokrovsky, D.V. Harkov, Graphite in science and nuclear technique. (2013). arXiv:1307.1869 [cond-mat.mtrl-sci]
4. http://www.olmec.co.uk/graphite_and_carbon_use_in_industrial_applications.htm . Accessed 16 Jan 2018
5. S. Pei, H.M. Cheng, The reduction of graphene oxide. Carbon 50, 3210–3228 (2012)