@article{ZVMMF_1985_25_9_a5,
     author = {O. Ya. Savchenko},
     title = {Determination of a domain inside of which there is an eigenvalue of a differential equation},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {1327--1335},
     publisher = {mathdoc},
     volume = {25},
     number = {9},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1985_25_9_a5/}
}