@article{ZVMMF_1996_36_7_a6,
     author = {R. R. Gadyl'shin},
     title = {On the perturbation of the {Laplacian} spectrum when the boundary condition type changes on a small part of the boundary},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {77--88},
     year = {1996},
     volume = {36},
     number = {7},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1996_36_7_a6/}
}