Fujii, Hiroaki, Christian F Kisielowski, Joachim  Krüger, Michael SH Leung, Ralf  Klockenbrink, Michael D Rubin, and Eicke R Weber. "Impact of Growth Temperature, Pressure and Strain on the Morphology of GaN Films." Ed. Krüger, Joachim. Materials Research Society Symposium N ? III-V Nitrides 1996: 227. LBNL-39850.

Fu, T.C., Nathan  Newman, Erin C Jones, James S Chan, Xiaohong  Liu, Michael D Rubin, Nathan W Cheung, and Eicke R Weber. "The Influence of Nitrogen Ion Energy on the Quality of GaN Films Grown with Molecular Beam Epitaxy." Journal of Electronic Materials 24.4 (1995) 249-255. LBL-37223.