Geodesic
Acoustic, electromagnetic and elastic wavefield energy expression via its asymptotics at large times and distances
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 50, Tome 493 (2020), pp. 269-287 Cet article a éte moissonné depuis la source Math-Net.Ru

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Simple formulae expressing whole energy of solutions of 3D wave equation, electro- and elastodynamics equations via their asymptotics at large times and distances are obtained. Some examples are considered. 
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A. B. Plachenov. Acoustic, electromagnetic and elastic wavefield energy expression via its asymptotics at large times and distances. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 50, Tome 493 (2020), pp. 269-287. http://geodesic.mathdoc.fr/item/ZNSL_2020_493_a17/

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