@article{KUKZ_1990_24_24_a2,
     author = {L. A. Aksent'ev and A. V. Kazantsev and M. I. Kinder and A. V. Kiselev},
     title = {Classes of uniqueness of an exterior inverse boundary value problem},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {39--62},
     year = {1990},
     volume = {24},
     number = {24},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1990_24_24_a2/}
}