@article{MZM_1995_58_6_a3,
     author = {A. A. Kiselev and I. Yu. Popov},
     title = {Indefinite metric and scattering by a~domain with a~small hole},
     journal = {Matemati\v{c}eskie zametki},
     pages = {837--850},
     publisher = {mathdoc},
     volume = {58},
     number = {6},
     year = {1995},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1995_58_6_a3/}
}