Mathematical modelling of elastic vibrations arising from four-body impact interactionV.S. Vyplaven, M.A. Gulyaev, A.A. Popkov, S.A. Becher, S.P. Shlyakhtenkov and A.L. BobrovE3S Web of Conf., 402 (2023) 03055DOI: https://doi.org/10.1051/e3sconf/202340203055