@article{KUKZ_1977_14_14_a1,
     author = {L. A. Aksent'ev},
     title = {Symmetric solutions of inverse boundary value problems},
     journal = {Trudy seminara po kraevym zada\v{c}am},
     pages = {20--27},
     publisher = {mathdoc},
     volume = {14},
     number = {14},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/KUKZ_1977_14_14_a1/}
}