Abstract:
This letter refers to the paper by A. F. Bunkin, A. A. Nurmatov and S. V. Pershin (Usp. Fiz. Nauk176 883 (2006) [Phys. Usp.49 855 (2006)]) and to the comments on it by A. F. Krupnov and M. Yu. Tretyakov (Usp. Fiz. Nauk179 1363 (2009) [Phys. Usp.52 (12) (2009)]).