Deformation waves in solidsEngelbrecht, JüriApplied wave mathematics : selected topics in solids, fluids, and mathematical methods2009 / p. 13-30 https://www.researchgate.net/profile/Jueri-Engelbrecht/publication/226633838_Deformation_Waves_in_Solids/links/0a85e53302909b0e6f000000/Deformation-Waves-in-Solids.pdf