Geodesic
The effective media for periodic anisotropic systems
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 13, Tome 128 (1983), pp. 130-138 
L. A. Molotkov; A. E. Khilo. The effective media for periodic anisotropic systems. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 13, Tome 128 (1983), pp. 130-138. http://geodesic.mathdoc.fr/item/ZNSL_1983_128_a13/
@article{ZNSL_1983_128_a13,
     author = {L. A. Molotkov and A. E. Khilo},
     title = {The effective media for periodic anisotropic systems},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {130--138},
     year = {1983},
     volume = {128},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_128_a13/}
}
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The paper deals with the wave propagation in periodic anisotropic system. The effective media for these systems are determined by the matrix method.