Geodesic
Perturbation of eigenvalues and eigenfunctions for a second-order differential equation under perturbation of the boundary
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 18 (1963) no. 4 
Zh. Ling. Perturbation of eigenvalues and eigenfunctions for a second-order differential equation under perturbation of the boundary. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 18 (1963) no. 4. http://geodesic.mathdoc.fr/item/RM_1963_18_4_a24/
@article{RM_1963_18_4_a24,
     author = {Zh. Ling},
     title = {Perturbation of eigenvalues and eigenfunctions for a second-order differential equation under perturbation of the boundary},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1963},
     volume = {18},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1963_18_4_a24/}
}
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