Geodesic
Perturbation of a polyharmonic operator by a potential of delta-function type
Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 1, pp. 86-87 
A. Fraguela Collar. Perturbation of a polyharmonic operator by a potential of delta-function type. Funkcionalʹnyj analiz i ego priloženiâ, Tome 15 (1981) no. 1, pp. 86-87. http://geodesic.mathdoc.fr/item/FAA_1981_15_1_a15/
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