TY  - JOUR
AU  - G. V. Zhdanova
TI  - Asymptotic series for the eigenvalues and eigenfunctions of second order self-adjoint operators
JO  - Differencialʹnye uravneniâ
PY  - 1971
SP  - 603
EP  - 614
VL  - 7
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1971_7_4_a2/
LA  - ru
ID  - DE_1971_7_4_a2
ER  -