R. M. Mazitov, V. A. Semenov, Yu. A. Lebedev, R. R. Mulyukov, G. I. Raab, E. L. Yadrovskii, V. N. Danilenko, “Density of phonon states in nanostructured copper”, Pis'ma v Zh. Èksper. Teoret. Fiz., 92:4 (2010), 267–272; JETP Letters, 92:4 (2010), 238–243
