A.A Berezin, Closed Electrical Transmission Line as a Ring Waveguide for Interacting Waves of Electron and Phonon Currents, Journal of Energy Conservation, Volume 1, Issue 2, 2019, Pages 28-45, ISSN 2642-3146, https://doi.org/10.14302/issn.2642-3146.jec-19-3049. (https://openaccesspub.orgjec/article/1192) Keywords: Fermi-Pasta-Ulam recurrences; electron and phonon currents; ferromagnetic and ferroacoustic resonances.