@article{DAN_1983_270_5_a17,
     author = {M. L. Gerver and N. S. Nadirashvili},
     title = {Nonscattering media},
     journal = {Doklady Akademii Nauk},
     pages = {1097--1100},
     year = {1983},
     volume = {270},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_270_5_a17/}
}