Atomic-scale formation of ultrasmooth surfaces on sapphire substrates for high-quality thin-film fabrication - Yoshimoto, M.; Maeda, T.; Ohnishi, T.; Koinuma, H.; Ishiyama, O.; Shinohara, M.; Kubo, M.; Miura, R.; Miyamoto, A. (American Institute of Physics (AIP), 1995)
http://dx.doi.org/10.1063/1.114313
Keywords: U