Geodesic
High-frequency point sources in an inhomogeneous elastic medium
Zapiski Nauchnykh Seminarov POMI, Interference waves in layered media. Part I, Tome 99 (1980), pp. 28-42

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Initial data for second-order terms of ray asymptotic for pressural and rotational sources are studied. Effects sought for disappear in case of homogeneous medium. Boundary layer technique is used. 
@article{ZNSL_1980_99_a3,
     author = {A. P. Kiselev},
     title = {High-frequency point sources in an inhomogeneous elastic medium},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {28--42},
     publisher = {mathdoc},
     volume = {99},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_99_a3/}
}
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A. P. Kiselev. High-frequency point sources in an inhomogeneous elastic medium. Zapiski Nauchnykh Seminarov POMI, Interference waves in layered media. Part I, Tome 99 (1980), pp. 28-42. http://geodesic.mathdoc.fr/item/ZNSL_1980_99_a3/