TY  - JOUR
AU  - Ling Zhengqiu
TI  - Perturbation of solutions and perturbation of eigenvalues and eigenfunctions of second-order elliptic equations under 

JO  - Doklady Akademii Nauk
PY  - 1964
SP  - 784
EP  - 787
VL  - 157
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1964_157_4_a7/
LA  - ru
ID  - DAN_1964_157_4_a7
ER  -