Inogamov, N. A. High Energy Astrophysics, MPI for Astrophysics, Max Planck Society;
Sunyaev, R. A. High Energy Astrophysics, MPI for Astrophysics, Max Planck Society;
Inogamov, N. A., & Sunyaev, R. A. (2015). Energy density of standing sound waves at the radiation-dominated phase of the universe expansion (hydrodynamic derivation). Astronomy Letters - a Journal of Astronomy and Space Astrophysics, 41(12), 693-703. doi:10.1134/S106377371512004X.