Chao-Hua Ma, Xin-Guo Ma, Cheng-Guo Li and Ling Miao. (2010). Structural Stability and Electronic Structure of N- or C-Monodoped $TiO_2$ from First-Principles Calculations.
Journal of Atomic and Molecular Sciences. 1 (1).
78-86.
doi:10.4208/jams.111009.120609a