Geodesic
On spectral stability problem for a pair of self-adjoint elliptic differential operators on bounded open sets
Eurasian mathematical journal, Tome 10 (2019) no. 3, pp. 84-88

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We prove estimates for the variation of the eigenvalues for a pair of self-adjoint elliptic differential operators in the case of diffeomorphic open sets. 
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     author = {V. I. Burenkov and B. Th. Tuyen},
     title = {On spectral stability problem for a pair of self-adjoint elliptic differential operators on bounded open sets},
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V. I. Burenkov; B. Th. Tuyen. On spectral stability problem for a pair of self-adjoint elliptic differential operators on bounded open sets. Eurasian mathematical journal, Tome 10 (2019) no. 3, pp. 84-88. http://geodesic.mathdoc.fr/item/EMJ_2019_10_3_a6/