1. https://www.ioffe.ru/SVA/NSM/Semicond/GaN/bandstr.html
2. Rammohan, R. L. (2001). Physical Review., 89, 11.
3. Johnson, W. C., Parsons, J. B., & Crew, M. C. (1932–1992). Journal of Physical Chemistry, 36, 2561; Science Letter, 11, 261.
4. Bloom, S., Harbeke, G., Meier, E., & Ortenburger, I. B. (1974). Physica Status Solidi, B, 66, 161.
5. Wright, A. F., & Nelson, J. S. (1994). Physical Review, B, 50, 2159.