Geodesic
On perturbation of a~polyharmonic operator by delta-like potentials
Sbornik. Mathematics, Tome 58 (1987) no. 2, pp. 389-396

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Some results are obtained on perturbation of a polyharmonic operator by potentials having small support. Bibliography: 9 titles. 
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     author = {A. Fraguela Collar},
     title = {On perturbation of a~polyharmonic operator by delta-like potentials},
     journal = {Sbornik. Mathematics},
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     volume = {58},
     number = {2},
     year = {1987},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1987_58_2_a4/}
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A. Fraguela Collar. On perturbation of a~polyharmonic operator by delta-like potentials. Sbornik. Mathematics, Tome 58 (1987) no. 2, pp. 389-396. http://geodesic.mathdoc.fr/item/SM_1987_58_2_a4/