Nitrogen doping in purely bonded forms of carbon
G. Jungnickel, P. K. Sitch, Th. Frauenheim, B. R. Eggen, M. I. Heggie, C. D. Latham, and C. S. G. Cousins
Phys. Rev. B 57, R661(R) (1998) - Published 1 January, 1998
Antiferroelectric phase transition in single crystals studied by NMR
A. Titze, G. Hinze, and R. Böhmer
Phys. Rev. B 57, R666(R) (1998) - Published 1 January, 1998