Counterexamples in inverse problems for parabolic, elliptic, and hyperbolic equations
Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 5, pp. 779-792

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Examples of inverse problems of source reconstruction with nonunique solutions are constructed. Problems for parabolic, elliptic, and hyperbolic equations are considered. Additional data (overdetermination) is specified as a final observation condition.
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     author = {A. B. Kostin},
     title = {Counterexamples in inverse problems for parabolic, elliptic, and hyperbolic equations},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
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     number = {5},
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A. B. Kostin. Counterexamples in inverse problems for parabolic, elliptic, and hyperbolic equations. Žurnal vyčislitelʹnoj matematiki i matematičeskoj fiziki, Tome 54 (2014) no. 5, pp. 779-792. http://geodesic.mathdoc.fr/item/ZVMMF_2014_54_5_a6/