TY  - JOUR
AU  - V. A. Il'in
AU  - Sh. A. Alimov
TI  - Conditions for the convergence of spectral decompositions that correspond to self-adjoint extensions of elliptic operators. I. Self-adjoint extension of the Laplace operator with a point spectrum
JO  - Differencialʹnye uravneniâ
PY  - 1971
SP  - 670
EP  - 710
VL  - 7
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1971_7_4_a9/
LA  - ru
ID  - DE_1971_7_4_a9
ER  -