Luminescence in hydrogenated amorphous carbon films grown by dc saddle-field glow-discharge decomposition of methane - Gaspari, F.; Kruzelecky, R. V.; Lim, P. K.; Sidhu, L. S.; Zukotynski, S. (American Institute of Physics (AIP), 1996)
http://dx.doi.org/10.1063/1.361139
Keywords: U