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An oversight of some previous density functional calculations of the bandgaps of wurtzite and cubic InN and of wurtzite GaN by Rinke et al. [Appl. Phys.Lett. 89,161919, 2006] led to an inaccurate and misleading statement relativeto limitations of density functional theory (DFT) for the description ofelectronic properties of these materials. These comments address thisstatement. In particular, they show that some local density approximation (LDA)calculations have correctly described or predicted electronic and relatedproperties of these systems [Phys. Rev. B 60, 1563, 1999; J. Appl. Phys. 96,4297, 2004, and 97, 123708, 2005]. These successful calculations solvedself-consistently the system of equations defining LDA, i.e., the Kohn-Shamequation and the equation giving the ground state charge density in terms ofthe wave functions of the occupied states.

Comments on "Band gap and band parameters of InN and GaN from  quasiparticle energy calculations based on exact-exchange density-functional  theory" [Appl. Phys. Lett. 89, 161919 (2006)]