Geodesic
Problem of the scattering of nonstationary waves by a one-dimensional obstacle
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 9, Tome 78 (1978), pp. 134-137

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In the work the problem is considered of the scattering of nonstationary waves by a one-dimensional obstacle: the case $h=\mathrm{const}$. 
@article{ZNSL_1978_78_a9,
     author = {K. K. Lavrent'ev},
     title = {Problem of the scattering of nonstationary waves by a one-dimensional obstacle},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {134--137},
     publisher = {mathdoc},
     volume = {78},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1978_78_a9/}
}
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K. K. Lavrent'ev. Problem of the scattering of nonstationary waves by a one-dimensional obstacle. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 9, Tome 78 (1978), pp. 134-137. http://geodesic.mathdoc.fr/item/ZNSL_1978_78_a9/