Conditions for the convergence of spectral decompositions that correspond to self-adjoint extensions of elliptic operators. III.~Best possible local estimates of Riesz means of an arbitrary function from the class $L_2(G)$ for a self-adjoint extension of the Laplace operator
Differencialʹnye uravneniâ, Tome 7 (1971) no. 6, pp. 1036-1041.

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     author = {V. A. Il'in},
     title = {Conditions for the convergence of spectral decompositions that correspond to self-adjoint extensions of elliptic operators. {III.~Best} possible local estimates of {Riesz} means of an arbitrary function from the class $L_2(G)$ for a self-adjoint extension of the {Laplace} operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1036--1041},
     publisher = {mathdoc},
     volume = {7},
     number = {6},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1971_7_6_a10/}
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V. A. Il'in. Conditions for the convergence of spectral decompositions that correspond to self-adjoint extensions of elliptic operators. III.~Best possible local estimates of Riesz means of an arbitrary function from the class $L_2(G)$ for a self-adjoint extension of the Laplace operator. Differencialʹnye uravneniâ, Tome 7 (1971) no. 6, pp. 1036-1041. http://geodesic.mathdoc.fr/item/DE_1971_7_6_a10/