Geodesic
A~remark concerning the theory of scattering for a~perturbed polyharmonic operator
Matematičeskie zametki, Tome 15 (1974) no. 3, pp. 445-454.

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Let $R_0$ and $R$ be resolvents of the operators $(-\Delta)^l$ and $(-\Delta)^l+q$ acting in $L_2(E^m)$. We study the problem of the belonging of the operator $R^P-R_0^p$ to various symmetrically-normed ideals of the ring of bounded operators. We give applications to the theory of scattering. 
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     author = {D. R. Yafaev},
     title = {A~remark concerning the theory of scattering for a~perturbed polyharmonic operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {445--454},
     publisher = {mathdoc},
     volume = {15},
     number = {3},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_15_3_a11/}
}
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D. R. Yafaev. A~remark concerning the theory of scattering for a~perturbed polyharmonic operator. Matematičeskie zametki, Tome 15 (1974) no. 3, pp. 445-454. http://geodesic.mathdoc.fr/item/MZM_1974_15_3_a11/