Geodesic
On one approach to an inverse problem solution for a~hyperbolic equation
Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 6 (2003) no. 4, pp. 431-439.

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The problem of determining a coefficient under the lower term of a hyperbolic equation is considered. A suitable residual functional is proposed to use for a numerical solution to this problem. A given algorithm allows to estimate an accuracy of an approximate solution on every step of the minimization procedure. 
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V. G. Romanov. On one approach to an inverse problem solution for a~hyperbolic equation. Sibirskij žurnal vyčislitelʹnoj matematiki, Tome 6 (2003) no. 4, pp. 431-439. http://geodesic.mathdoc.fr/item/SJVM_2003_6_4_a7/

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