Geodesic
On a method of solution of some elastic wave propagation problems in inhomogeneous periodio media
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 15, Tome 148 (1985), pp. 30-33 
O. Baigonysov; S. Tleukenov. On a method of solution of some elastic wave propagation problems in inhomogeneous periodio media. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 15, Tome 148 (1985), pp. 30-33. http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a2/
@article{ZNSL_1985_148_a2,
     author = {O. Baigonysov and S. Tleukenov},
     title = {On a method of solution of some elastic wave propagation problems in inhomogeneous periodio media},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {30--33},
     year = {1985},
     volume = {148},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1985_148_a2/}
}
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Propagation of harmonic $P$ and $ST$ waves in periodic in homogeneous media is considered by means of matrix technique.