TY  - JOUR
AU  - V. A. Il'in
AU  - A. F. Filippov
TI  - The character of the spectrum of a selfadjoint extension of the Laplace operator in a bounded region (fundamental 

JO  - Doklady Akademii Nauk
PY  - 1970
SP  - 267
EP  - 269
VL  - 191
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1970_191_2_a1/
LA  - ru
ID  - DAN_1970_191_2_a1
ER  -