@article{DE_1971_7_6_a10,
     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/}
}