1. N.W. Jepps, T.F. Page, Progr. Cryst. Growth Charact. 7, 259 (1983)
2. P. Masri, Surf. Sci. Rep. 48, 1 (2002)
3. O. Madelung, M. Schulz, H. Weiss, in Semiconductors, Physics of Group IV Elements and III-V compounds, edited by K.H. Hellwege, O. Madelung, Landolt-Börnstein, New Series, Group III, Vol. 17, Pt. a (Springer-Verlag, Berlin, 1982)
4. V. Lebedev, V. Cimalla, U. Kaiser, Ch. Foerster, J. Pezoldt, J. Biskupek, O. Ambacher, J. Appl. Phys. 97, 114306 (2005)
5. Properties of Group-III Nitrides, edited by J.H. Edgar, EMIS Datareviews Series (IEE, London, 1994)