M. I. Konchatnii, N. P. Merenkov, O. N. Shekhovtsova, “QED corrections in radiative return method at measurement of the $e^+e^-\to \pi^+\pi^-$ cross–section below 1 GeV”, Pis'ma v Zh. Èksper. Teoret. Fiz., 78:2 (2003), 61–66; JETP Letters, 78:2 (2003), 51–56
