Geodesic
Nonstationary inverse problem for the multidimensional wave equation “in the large”
Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 21-30 
M. I. Belishev; Ya. V. Kurylev. Nonstationary inverse problem for the multidimensional wave equation “in the large”. Zapiski Nauchnykh Seminarov POMI, Mathematical problems in the theory of wave propagation. Part 17, Tome 165 (1987), pp. 21-30. http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a3/
@article{ZNSL_1987_165_a3,
     author = {M. I. Belishev and Ya. V. Kurylev},
     title = {Nonstationary inverse problem for the multidimensional wave equation {\textquotedblleft}in the large{\textquotedblright}},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {21--30},
     year = {1987},
     volume = {165},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1987_165_a3/}
}
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The nonsteady (dynamic) inverse problem of reconstructing the variable velocity of wave propagation in a multidimensional region $\Omega$ with a smooth boundary $\Gamma$ is studied.