Geodesic
Perturbation methods for inverse problems related to degenerate differential equations
Journal of computational and engineering mathematics, Tome 1 (2014) no. 2, pp. 32-44.

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Identification problem for possibly degenerate evolution equations on Banach spaces are considered. Such inverse problems are changed to direct differential problem, whose regular solvability has had recently large development. Some applications to concrete PDEs are given.
Keywords: inverse problem, degenerate differential equation, linear relation, perturbation method. 
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A. Favini. Perturbation methods for inverse problems related to degenerate differential equations. Journal of computational and engineering mathematics, Tome 1 (2014) no. 2, pp. 32-44. http://geodesic.mathdoc.fr/item/JCEM_2014_1_2_a3/

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