1. Phonon density of states of bulk gallium nitride
2. G.Ya. Lyubarskii, The Application of Group Theory in Physics, Pergamon Press, Oxford, 1960.
3. A.P. Cracknell, B.L. Davies, S.C. Miller, W.F. Love, Kronecker Product Tables, vol. 1–4, 1F1/Plenum Press, New York, Washington, London, 1979.
4. G.F. Koster, Space Group and Their Representation, Academic Press, New York, 1957.
5. L.E. McNeil, in: James H. Edgar (Ed.) Properties of Group III Nitrides, EMIS Datareviews Series No. 11, Kansas State University, USA, 1994, p. 252.