@article{ZVMMF_1979_19_5_a12,
     author = {N. S. Grigor'ev},
     title = {Asymptotic behaviour of~quasi-eigenvalues of~the {Laplace} operator in~the case of~the outside of~a~circular disc},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1217--1227},
     publisher = {mathdoc},
     volume = {19},
     number = {5},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1979_19_5_a12/}
}