Geodesic
Asymptotic representation of the solution of the problem of the propagation of acoustic waves in a non-uniform compressible relaxing medium
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 30 (1990) no. 5, pp. 705-715 
V. V. Varlamov; A. V. Nesterov. Asymptotic representation of the solution of the problem of the propagation of acoustic waves in a non-uniform compressible relaxing medium. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 30 (1990) no. 5, pp. 705-715. http://geodesic.mathdoc.fr/item/ZVMMF_1990_30_5_a6/
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     title = {Asymptotic representation of the solution of the problem of the propagation of acoustic waves in a~non-uniform compressible relaxing medium},
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Voir la notice de l'article provenant de la source Math-Net.Ru

An equation describing the propagation of non-stationary acoustic waves in a non-uniform compressible relaxing medium is derived. The problem of the existence and uniqueness of a solution of the first initialboundary value problem for this equation is studied. The first term of the asymptotic expansion of the solution with respect to a small parameter multiplying the operator of the highest order in the equation is constructed.

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