“…Here we note that the coefficients β 1 , β 2 , β 5 , β 6 , β 7 , β 11 , β 13 , β 15 and β 16 depend on the elastic coefficients, β 4 , β 9 , β 10 , β 12 , β 17 −β 19 characterize the viscoelastic effects and β 3 , β 8 and β 14 are related to the inertial effects. The explicit expressions of these coefficients are given in reference [19].…”