Geodesic
Scattering by rigid mobile inclusion
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 16, Tome 156 (1986), pp. 61-68 
M. I. Ivanov. Scattering by rigid mobile inclusion. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 16, Tome 156 (1986), pp. 61-68. http://geodesic.mathdoc.fr/item/ZNSL_1986_156_a5/
@article{ZNSL_1986_156_a5,
     author = {M. I. Ivanov},
     title = {Scattering by rigid mobile inclusion},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {61--68},
     year = {1986},
     volume = {156},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1986_156_a5/}
}
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Long elastic wave scattering by rigid inclusion is investigated. Mobility of the inclusion leads to non-classical boundary conditions. The external solution is the multipole Anzatz. In the neighbourhood of the inclusion elastostatic problems are considered. As a result the integral characteristic of rigid mobile inclusion arises which is the analogy of tensor $e_{ij}$ considered by Polya and Szegö.