Geodesic
Some inverse problems of oscillation theory
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 5, pp. 1158-1167

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An inverse problem for the Helmholtz equation is analyzed and the uniqueness theorems for its solution are given. The particular feature of the problem consists in using multifrequency information. It is shown that some inverse problems of wave diffraction can be reduced to the above problem for the wave equation. 
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     author = {A. S. Zapreev and V. A. Tsetsocho},
     title = {Some inverse problems of oscillation theory},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1158--1167},
     publisher = {mathdoc},
     volume = {23},
     number = {5},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_5_a11/}
}
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A. S. Zapreev; V. A. Tsetsocho. Some inverse problems of oscillation theory. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 23 (1983) no. 5, pp. 1158-1167. http://geodesic.mathdoc.fr/item/ZVMMF_1983_23_5_a11/