Geodesic
Locality of Quadratic Forms for Point Perturbations of Schr\"odinger Operators
Matematičeskie zametki, Tome 70 (2001) no. 3, pp. 425-433.

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In this paper we study point perturbations of the Schrödinger operators within the framework of Krein's theory of self-adjoint extensions. A locality criterion for quadratic forms is proved for such perturbations. 
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K. V. Pankrashin. Locality of Quadratic Forms for Point Perturbations of Schr\"odinger Operators. Matematičeskie zametki, Tome 70 (2001) no. 3, pp. 425-433. http://geodesic.mathdoc.fr/item/MZM_2001_70_3_a9/

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