Li, D., K. Bao, et al. (2012). "Lowest enthalpy polymorph of cold-compressed graphite phase." Physical Chemistry Chemical Physics 14(13): 4347-4350.

Based on an ab initio evolutionary algorithm, a novel carbon polymorph with an orthorhombic Cmcm symmetry is predicted, named as C carbon, which has the lowest enthalpy among the previously proposed cold-compressed graphite phases.