TY  - JOUR
AU  - V. A. Il'in
TI  - Fourier series in fundamental systems of functions of the Beltrami operator
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 1940
EP  - 1978
VL  - 5
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_11_a1/
LA  - ru
ID  - DE_1969_5_11_a1
ER  -