Abstract
Our reply to critical comments by A F Krupnov and M Yu Tretyakov (Usp. Fiz. Nauk 179 1363 (2009) [Phys. Usp. 52 (12) 1273 (2009)]) and M A Bol'shov, A A Makarov, and V R Mironenko (Usp. Fiz. Nauk 179 1368 (2009) [Phys. Usp. 52 (12) 1279 (2009)]) on a paper by A F Bunkin, A A Nurmatov, and S M Pershin (Usp. Fiz. Nauk 176 883 (2006) [Phys. Usp. 49 855 (2006)]).